c语言第六章(苏小红版)

完美 WORD 格式2.2 #include<stdio.h>main(){float x=2.5,y=2.5,z=2.5;printf("x=%f\n",x);printf("y=%f\n",y);printf("z=%f\n",z);}3.1(1) #include<stdio.h>main(){int a=12,b=3;float x=18.5,y=4.6;printf("%d\n",(float)(a*b)/2);printf("%d\n",(int)x%(int)y);}3.2 #include<stdio.h>main(){int x,b0,b1,b2,s;printf("Inputx:");scanf("%d",&x);b2=x/100;b1=(x-b2*100)/10;b0=x%10;s=b0*100+b1*10+b2;printf("s=%d\n",s);}3.3 #include<stdio.h>#include<math.h>main(){float rate=0.0225;float n,capital,deposit;printf("Input n,capital:");scanf("%f,%f",&n,&capital);deposit=capital*pow(1+rate,n);printf("deposit=%f\n",deposit);}3.4 #include<stdio.h>#include<math.h>main(){float a,b,c;专业知识分享完美 WORD 格式double x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}4.1(1) #include<stdio.h>main(){char c1='a',c2='b',c3='c';printf("a%cb%cc%c\n",c1,c2,c3); }4.1(2) #include<stdio.h>main(){int a=12,b=15;printf("a=%d%%,b=%d%%\n",a,b); }4.1(3) #include<stdio.h>main(){int a,b;scanf("%2d%*2s%2d",&a,&b);printf("%d,%d\n",a,b);}4.2 #include<stdio.h>main(){long a,b;float x,y;scanf("%d,%d\n",&a,&b);scanf("%f,%f\n",&x,&y);printf("a=%d,b=%d\n",a,b);printf("x=%f,b=%f\n",x,y);}5.1 #include<stdio.h>main(){float a;printf("Innputa:");scanf("%f",&a);if(a>=0){专业知识分享完美 WORD 格式a=a;printf("a=%f\n",a);}else{a=-a;printf("a=%f\n",a);}}5.2 #include<stdio.h>main(){int a;printf("Inputa:");scanf("%d",&a);if(a%2==0){printf("a 是偶数 ");}else{printf("a 是奇数 ");}}5.3 #include<stdio.h>#include<math.h>main(){float a,b,c,s,area;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a+b>c&&a+c>b&&b+c>a){s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%f\n",area);}else{printf(" 不是三角形 ");}}5.4 #include<stdio.h>#include<math.h>专业知识分享完美 WORD 格式main(){float a,b,c,x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a==0){printf(" 该方程不是一元二次方程\n");}if(b*b-4*a*c>0){x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}else if(b*b-4*a*c==0){x=-b/(2*a);y=-b/(2*a);printf("x=%f,y=%f\n",x,y);}else{printf(" 该方程无实根\n");}}5.5 #include<stdio.h>main(){int year,flag;printf("Input a year:");scanf("%d",&year);if(year%4==0&&year%400!=0||year%400==0) {flag=1;}else{flag=0;}if(flag==1){printf("%d is a leap year !\n",year); }专业知识分享完美 WORD 格式else{printf("%d is not a leap year !\n",year);}}5.6 #include<stdio.h>main(){int year,flag;printf("Input a year:");scanf("%d",&year);flag=year%400==0||year%4==0&&year%100!=0?1:0;if(flag==1&&flag!=0){printf("%d is a leap year !\n",year);}else{printf("%d is not a leap year !\n",year);}}5.7 #include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>='a'&&ch<='z'){ch=getchar();ch=ch-32;printf("%c,%d\n",ch,ch);}else if(ch>='A'&&ch<='Z'){ch=getchar();ch=ch+32;printf("%c,%d\n",ch,ch);}else{printf("%c",ch);}}专业知识分享完美 WORD 格式5.8 #include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>=48&&ch<=57){printf("ch 是数字字符 \n");}else if(ch>=65&&ch<=90){printf("ch 是大写字母 \n");}else if(ch>=97&&ch<=122){printf("ch 是小写字母 \n");}else if(ch==32){printf("ch 是空格 \n");}else{printf("ch 是其他字符 \n");}}5.9 #include<stdio.h>main(){int score,grade;printf("Input score:");scanf("%d",&score);grade=score/10;if(score<0||score>100){printf("Input error\n");}if(score>=90&&score<=100){printf("%d--A\n",score);}else if(score>=80&&score<90){专业知识分享完美 WORD 格式printf("%d--B\n",score);}else if(score>=70&&score<80){printf("%d--C\n",score);}else if(score>=60&&score<70){printf("%d--D\n",score);}else if(score>=0&&score<60){printf("%d- -E\n",score);}}5.10 #include<stdio.h>main(){int year,month;printf("Input year,month:");scanf("%d,%d",&year,&month);if(month>12||month<=0){printf("error month\n");}else{switch(year,month){case 12:case 10:case 8:case 7:case 5:case 3:case 1:printf("31 天 \n");break;case 11:case 9:case 6:case 4:printf("30 天 \n");break;专业知识分享完美 WORD 格式case 2:if(year%4==0&&year!=0||year%400==0){printf("29 天 \n");}else{printf("28 天 \n");}break;default:printf("Input error\n");}}}6.1(1) #include<stdio.h>main(){int i,j,k;char space=' ';for(i=1;i<=4;i++){for(j=1;j<=i;j++){printf("%c",space);}for(k=1;k<=6;k++){printf("*");}printf("\n");}}6.1(2) #include<stdio.h>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0) continue;k--;}printf("k=%d\n,n=%d\n",k,n);}专业知识分享完美 WORD 格式6.1(3) #include<stdio.h>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0) break;k--;}printf("k=%d,n=%d\n",k,n); }6.2(1) #include<stdio.h> main(){int i,sum=0;for(i=1;i<=101;i++){sum=sum+i;}printf("sum=%d\n",sum); }6.2(2) #include<stdio.h>main(){long i;long term,sum=0;for(i=1;i<=101;i=i+2){term=i*(i+1)*(i+2);sum=sum+term;}printf("sum=%ld\n",sum); }6.2(4) #include<stdio.h>#include<math.h>main(){int n=1;float term=1.0,sign=1,sum=0; while(term<=-1e-4||term>=1e-4) {term=1.0/sign;sum=sum+term;sign=sign+n;专业知识分享完美 WORD 格式n++;}printf("sum=%f\n",sum);}6.2(5) #include<stdio.h>#include<math.h>main(){int n=1,count=1;float x;double sum,term;printf("Input x:");scanf("%f",&x);sum=x;term=x;do{term=-term*x*x/((n+1)*(n+2));sum=sum+term;n=n+2;count++;}while(fabs(term)>=1e-5);printf("sin(x)=%f,count=%d\n",sum,count);}6.3 #include<stdio.h>main(){int x=1,find=0;while(!find){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;x++;}}}/* int x,find=0;for (x=1;!find;x++){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;专业知识分享完美 WORD 格式}}}*/6.4 #include<stdio.h>main(){int i,n;long p=1,m=1;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){p=i*i;m=i*i*i;printf("p=%d,m=%d\n",i,p,i,m);}}6.5 #include<stdio.h>main(){float c,f;for(c=-40;c<=110;c=c+10){f=9/5*c+32;printf("f=%f\n",f);}}6.6 #include<stdio.h>#include<math.h>main(){int n;double c=0.01875,x;do{x=x*pow(1+c,12)-1000;n++;}while(x>0);printf("x=%d\n",x);}6.7 #include<stdio.h>main(){int n=0;专业知识分享完美 WORD 格式float a=100.0,c;printf("Inputc:");scanf("%f",&c);do{a=a*(1+c);n++;}while(a<=200);printf("n=%d\n",n);}6.8 #include<stdio.h>#include<math.h>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=pow(-1,count)*(1.0/(n+2));sum=sum+term;n=n+2;count++;}sum=4*sum;printf( "sum=%f,count=%d\n",sum,count); }6.9 #include<stdio.h>#include<math.h>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=term*(1.0/n);sum=sum+term;n++;count++;}printf("sum=%f,count=%d\n",sum,count); }6.10 #include<stdio.h>#include<math.h>专业知识分享完美 WORD 格式main(){int x;for(x=100;x<=999;x++){if(x==pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3))printf("x=%d\n",x);}}6.11 #include<stdio.h>main(){int i=0,n;long sum=0,term=1;printf("Inputn:");scanf("%d",&n);do{i++;term=term*i;sum=sum+term;}while(sum<n);printf("%d\n",i-1);}6.12 #include<stdio.h>main(){int i,n,m,count=0,sum=0;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);专业知识分享完美 WORD 格式}}6.13 #include<stdio.h>main(){int i,n,m,count=0,sum=0;printf("Inputn:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0||m<0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}6.14 #include<stdio.h>main(){int x,y,z;for(x=0;x<=17;x++){for(y=0;y<=25;y++){3*x+2*y+z==50;z=30-x-y;if( 3*x+2*y+z==50&&x+y+z==30)printf("x=%d,y=%d,z=%d\n",x,y,z);}}}6.15 #include<stdio.h>main(){int x,y;for(x=0;x<=98;x++)专业知识分享完美 WORD 格式{y=98-x;2*x+4*y==386;if(x+y==98&&2*x+4*y==386){printf("x=%d,y=%d\n",x,y);}}}6.16 #include<stdio.h>main(){int x,y,z;for(x=0;x<=20;x++){for(y=0;y<=33;y++){3*y+5*x+z/3.0==100;z=100-x-y;if (5*x+3*y+z/3.0==100&&z+x+y==100){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}6.17 #include<stdio.h>main(){int x,y,z;for(x=1;x<=9;x++){for(y=1;y<=17;y++){10*x+5*y+z==100;z=50-x-y;if( 10*x+5*y+z==100&&x+y+z==50&&z>0){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}专业知识分享完美 WORD 格式}7.1 #include<stdio.h> int Square(int i){return i*i;}int main(){int i=0;i=Square(i);for( ;i<3;i++){static int i=1;i+=Square(i);printf("%d,",i);}printf("%d\n",i);return 0;}7.2 #include<stdio.h> int hour,minute,second; void update(){second++;if(second==60){second=0;minute++;}if(minute==60){minute=0;hour++;}if(hour==24)hour=0;}void display(){printf("%d,%d,%d\n",hour,minute,second);}void delay(){专业知识分享完美 WORD 格式int t;for(t=0;t<100000000;t++);}int main(){int i;void updaye(),display(),delay();for(i=0;i<1000000;i++){update();display();delay();}return 0;}7.3 #include<stdio.h>int GetMax(int a,int b);int main(){int x,y,max;printf("Inputx,y:");scanf("%d,%d",&x,&y);max=GetMax(x,y);printf("max=%d\n",max);return 0;}int GetMax(int m,int n){if(m>=n)return m;elsereturn n;}7.4 #include<stdio.h>int LCM(int n,int m);int main(){int a,b;printf("Inputa,b:");scanf("%d,%d",&a,&b);printf("%d\n",LCM(a,b));return 0;}int LCM(int n,int m)专业知识分享完美 WORD 格式{int x;int find=0;for(x=1;!find;x++){if(x%n==0&&x%m==0){find=1;}}return x-1;}7.5 #include<stdio.h>long Fact(int n);int main(){int m,a;printf("Inputm:");scanf("%d",&m);for(a=1;a<=m;a++){printf("%d!=%ld\n",a,Fact(a));}return 0;}long Fact(int n){int i;long result=1;for(i=2;i<=n;i++)result*=i;return result;}7.6 #include<stdio.h>long Fact(int n);int main(){int m;long ret;printf("Inputm:");scanf("%d",&m);ret=Fact(m);printf("ret=%d\n",ret);专业知识分享完美 WORD 格式return 0;}long Fact(int n){int i;long result=1,sum=0;for(i=2;i<=n;i++){result*=i;sum=sum+result;}return sum;}7.7(1) #include<stdio.h>int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return 0;}int Gcd(int a,int b){int t,min,find=0;min=a<b?a:b;t=min;for(t=min;!find;t--){a%t==0;b%t==0;if(a%t==0&&b%t==0)return t;}find=1;}7.7(2) #include<stdio.h>int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);专业知识分享完美 WORD 格式printf("%d\n",Gcd(m,n));return 0;}int Gcd(int a,int b){int r,temp;r=a%b;if(r==0)return b;elsedo{temp=b;b=r;a=temp;r=a%b;}while(r!=0);return b;}8.1(1) #include<stdio.h> void Func(int x){x=2;}int main(){int x=10;Func(x);printf("%d",x);return 0;}8.1(2) #include<stdio.h> void Func(int b[]){int j;for(j=0;j<4;j++){b[j]=j;}}int main(){static int a[]={5,6,7,8},i;Func(a);for(i=0;i<4;i++)专业知识分享完美 WORD 格式{printf("%d",a[i]);}return 0;}8.2(1) int PositiveNum(int a[],int n) {int i,count=0;for(i=0;i<n;i++){if(a[i]>0)count++;}return 0;}8.2(2) void Fib(long f[],long n){int i;f[0]=0;f[1]=1;for(i=2;i<n;i++){f[i]=f[i-1]+f[i-2];}}8.2(3) #include<stdio.h>int main(){int a[10],n,max,min,maxPos,minPos;for(n=0;n<10;n++){scanf("%d",&a[n]);}max=min=a[0];maxPos=minPos=0;for(n=0;n<10;n++){if(a[n]>max){max=a[n];maxPos=n;}else if(a[n]<min){min=a[n];专业知识分享完美 WORD 格式minPos=n;}}printf("max=%d,pos=%d\n",max,maxPos);printf("min=%d,pos=%d\n",min,minPos);return 0;}8.3 void DivArray(int *pArray,int n){int i;for(i=0;i<n;i++){pArray[i]/=pAttay[0];}}8.4 #include<stdio.h>#define N 40int FailNum(int score[],int n);void ReadScore(int score[],int n);int main(){int score[N],n;printf("Input n:");scanf("%d",&n);ReadScore(score,n);FailNum(score,n);printf("FailNum students are %d\n",FailNum(score,n));return 0;}int FailNum(int score[],int n){int i,count=0;for(i=0;i<n;i++){if(score[i]<60)count++;}return count;}void ReadScore(int score[],int n){int i;printf("Input score:");for(i=0;i<n;i++)专业知识分享完美 WORD 格式{scanf("%d",&score[i]);}}8.5 #include<stdio.h>#define N 40int HighAver(int score[],int n);int ReadScore(int score[]);int main(){int score[N],n;n=ReadScore(score);printf("HighAver students are %d\n",HighAver(score,n));return 0;}int HighAver(int score[],int n){int i,count=0,sum=0,aver;for(i=0;i<n;i++){sum=sum+score[i];aver=sum/n;}for(i=0;i<n;i++){if(score[i]>aver)count++;}return count;}int ReadScore(int score[]){int i=-1;do{i++;printf("Input score:");scanf("%d",&score[i]);}while(score[i]>=0);return i;}8.6 #include<stdio.h>#define N 40int ReadScore(int score[],long num[]);int FindMax(int score[],long num[],int n);专业知识分享完美 WORD 格式int main(){int score[N],n,max,num,t;long num[N];t=FindMax(score,n);max=score[t];num=num[t];printf("max=%d,num=%d\n",max,num);return 0;}int ReadScore(int score[],long num[]){int i=-1;do{i++;printf("Input student's ID and score:");scanf("%ld%d",&num[i],&score[i]);}while(num[i]>0&&score[i]>=0);return i;}int FindMax(int score[],long num[],int n){int max,i;max=score[0];for(i=1;i<n;i++){if(score[i]>max)max=score[i];}return i;}8.7 #include<stdio.h>#define N 40int Read(int a[]);int ChangeArry(int a[],int n);int main(){int a[N],n;printf("%d\n",ChangeArry(a,n));return 0;}int Read(int a[]){int i;专业知识分享完美 WORD 格式for(i=0;i<9;i++){printf("Input a:");scanf("%d",&a[i]);return i;}int ChangeArry(int a[],int n){int max,min,i,maxpos,minpos,term;max=min=score[0];for(i=1;i<n;i++){if(a[i]>max)max=score[i];maxpos=n;else(a[i]<min)min=a[i];minpos=n;temp=maxpos;maxpos=minpos;minpos=temp;}return a[i];}8.10 #include<stdio.h>#define N 5void main(){int a[N][N];int sum = 0;int i, j;printf(" 请输入一个 %d*%d 的矩阵 \n",N,N);for(i = 0; i < N; i++){for(j = 0; j < N; j++){scanf("%d",&a[i][j]);}}for(i = 0; i < N; i++){for(j = 0; j < N; j++){专业知识分享。

第六章习题1。

（1）#include〈stdio。

h〉main（）{int i,j，k；char space=’ ’；for（i=1；i〈=4;i++)｛for（j=1;j<=i；j++）｛printf("%c",space）;}for(k=1；k<=6;k++）{printf（"*")；}printf（"\n”）；}｝(2）＃include 〈stdio.h>main（）{int k = 4, n;for （n = 0；n < k; n++)｛if （n ％2 == 0）continue；k—-;}printf(”k = ％d，n = ％d\n”,k，n)；}（3)＃include 〈stdio。

h〉main（）{int k = 4, n;for （n = 0; n < k; n++）{if （n % 2 ==0）break；k—-；｝printf(”k = %d, n = %d\n"，k，n）;}2．（1）计算1+3+5+……99+101=＃include<stdio。

h>main（)｛int i,sum=0;for（i=1；i〈=101;i=i+2）{sum=sum+i；}printf(”sum=％d\n"，sum）;}(2）计算1*2＊3+3＊4＊5+。

..+99＊100＊101= #include〈stdio。

h〉main（)｛long i；long term,sum=0;for(i=1;i〈=99;i=i+2）{term=i*(i+1)＊(i+2）;sum=sum+term；｝printf(”sum=％ld",sum）；｝（3)计算a+aa+aaa+..。

+aa..。

a（n个a）的值＃include〈stdio.h>main( ）｛long term=0，sum=0；int a，i,n;printf（"input a,n：”）；scanf(”%d，%d”,&a，＆n）;for(i=1;i〈=n；i=i++)｛term=term*10+a；sum=sum+term;｝printf("sum=%ld\n”，sum）;｝（4 ）计算1—1/2+1/3—。

2.2#include<stdio.h>main(){float x=2.5,y=2.5,z=2.5;printf("x=%f\n",x);printf("y=%f\n",y);printf("z=%f\n",z);}3.1(1)#include<stdio.h>main(){int a=12,b=3;float x=18.5,y=4.6;}3.1(2)#include<stdio.h>main(){int x=32,y=81,p,q;p=x++;q=--y;printf("%d %d\n",p,q);printf("%d %d\n",x,y);}3.2#include<stdio.h>main(){int x,b0,b1,b2,s;printf("Inputx:");scanf("%d",&x);b2=x/100;b1=(x-b2*100)/10;//或(x%100)/10;或x/10%10;b0=x%10;s=b0*100+b1*10+b2;printf("s=%d\n",s);}3.3#include<stdio.h>#include<math.h>main(){float rate=0.0225;float n,capital,deposit;printf("Input n,capital:");scanf("%f,%f",&n,&capital);deposit=capital*pow(1+rate,n);printf("deposit=%f\n",deposit); }3.4#include<stdio.h>#include<math.h>main(){float a, b, c;double x, y;printf("Input a, b, c:");scanf("%f %f %f", &a, &b, &c);x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}习题44.1(1)#include<stdio.h>main(){char c1='a',c2='b',c3='c';}4.1(2)#include<stdio.h>main(){int a=12,b=15;}4.1(3)#include<stdio.h>main(){int a,b;printf("%d,%d\n",a,b);}4.2#include<stdio.h>main(){long a,b;float x,y;scanf("%d,%d\n",&a,&b);scanf("%f,%f\n",&x,&y);printf("a=%d,b=%d\n",a,b);printf("x=%f,b=%f\n",x,y); }5.1#include<stdio.h>main(){float a;printf("Input a:");scanf("%f",&a);if(a>=0){a=a;printf("a=%f\n",a);}else{a=-a;printf("a=%f\n",a);}}5.2#include<stdio.h>main(){int a;printf("Input a:");scanf("%d", &a);if(a%2==0){printf("a是偶数");}else{printf("a是奇数");}}5.3#include<stdio.h>#include<math.h>main(){float a,b,c,s,area;printf("Input a, b, c:");scanf("%f %f %f", &a, &b, &c);if(a+b>c&&a+c>b&&b+c>a){s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%f\n",area);}else{printf("不是三角形");}}5.4#include<stdio.h>#include<math.h>main(){float a,b,c,x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a==0){printf("该方程不是一元二次方程\n");}if(b*b-4*a*c>0){x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}else if(b*b-4*a*c==0){x=-b/(2*a);y=-b/(2*a);printf("x=%f,y=%f\n",x,y);}else{printf("该方程无实根\n");}}5.5#include<stdio.h>main(){int year,flag;printf("Input a year:");scanf("%d",&year);if(year%4==0&&year%400!=0||year%400==0){flag=1;}else{flag=0;}if(flag==1){printf("%d is a leap year!\n",year);}else{printf("%d is not a leap year!\n",year);}}5.6#include<stdio.h>main(){int year,flag;printf("Input a year:");scanf("%d",&year);flag=year%400==0||year%4==0&&year%100!=0?1:0;if(flag==1&&flag!=0){printf("%d is a leap year!\n",year);}else{printf("%d is not a leap year!\n",year);}}5.7#include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>='a'&&ch<='z'){ch=getchar();ch=ch-32;printf("%c,%d\n",ch,ch);}else if(ch>='A'&&ch<='Z'){ch=getchar();ch=ch+32;printf("%c,%d\n",ch,ch);}else{printf("%c",ch);}}5.8#include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>=48&&ch<=57){printf("ch是数字字符\n");}else if(ch>=65&&ch<=90){printf("ch是大写字母\n");}else if(ch>=97&&ch<=122){printf("ch是小写字母\n");}else if(ch==32){printf("ch是空格\n");}else{printf("ch是其他字符\n");}}5.9#include<stdio.h>main(){int score,grade;printf("Input score:");scanf("%d",&score);grade=score/10;if(score<0||score>100){printf("Input error\n");}if(score>=90&&score<=100){printf("%d--A\n",score);}else if(score>=80&&score<90){printf("%d--B\n",score);}else if(score>=70&&score<80){printf("%d--C\n",score);}else if(score>=60&&score<70){printf("%d--D\n",score);}else if(score>=0&&score<60){printf("%d--E\n",score);}}5.10#include<stdio.h>main(){int year,month;printf("Input year,month:");scanf("%d,%d",&year,&month);if(month>12||month<=0){printf("error month\n");}else{switch(year,month){case12:case10:case8:case7:case5:case3:case1:printf("31天\n");break;case11:case9:case6:case4:printf("30天\n");break;case2:if(year%4==0&&year!=0||year%400==0){printf("29天\n");}else{printf("28天\n");}break;default:printf("Input error\n");}}}6.1(1)#include<stdio.h>main(){int i,j,k;char space='';for(i=1;i<=4;i++){for(j=1;j<=i;j++){printf("%c",space);}for(k=1;k<=6;k++){printf("*");}printf("\n");}}6.1(2)#include<stdio.h>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0)continue;k--;}printf("k=%d\n,n=%d\n",k,n);}6.1(3)#include<stdio.h>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0)break;k--;}printf("k=%d,n=%d\n",k,n);}6.2(1)#include<stdio.h>main(){int i,sum=0;for(i=1;i<=101;i++){sum=sum+i;}printf("sum=%d\n",sum);}6.2(2)#include<stdio.h>main(){long i;long term,sum=0;for(i=1;i<=101;i=i+2){term=i*(i+1)*(i+2);sum=sum+term;}printf("sum=%ld\n",sum);}6.2(4)#include<stdio.h>#include<math.h>main(){int n=1;float term=1.0,sign=1,sum=0;while(term<=-1e-4||term>=1e-4){term=1.0/sign;sum=sum+term;sign=sign+n;n++;}printf("sum=%f\n",sum);}6.2(5)#include<stdio.h>#include<math.h>main(){int n=1,count=1;float x;double sum,term;printf("Input x:");scanf("%f",&x);sum=x;term=x;do{term=-term*x*x/((n+1)*(n+2));sum=sum+term;n=n+2;count++;}while(fabs(term)>=1e-5);printf("sin(x)=%f,count=%d\n",sum,count);}6.3#include<stdio.h>main(){int x=1,find=0;while(!find){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;x++;}}}/*int x,find=0;for(x=1;!find;x++){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;}}}*/6.4#include<stdio.h>main(){int i,n;long p=1,m=1;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){p=i*i;m=i*i*i;printf("p=%d,m=%d\n",i,p,i,m);}}6.5#include<stdio.h>main(){float c,f;for(c=-40;c<=110;c=c+10){f=9/5*c+32;printf("f=%f\n",f);}}6.6#include<stdio.h>#include<math.h>main(){int n;double c=0.01875,x;do{x=x*pow(1+c,12)-1000;n++;}while(x>0);printf("x=%d\n",x);}6.7#include<stdio.h>main(){int n=0;float a=100.0,c;printf("Inputc:");scanf("%f",&c);do{a=a*(1+c);n++;}while(a<=200);printf("n=%d\n",n);}6.8#include<stdio.h>#include<math.h>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=pow(-1,count)*(1.0/(n+2));sum=sum+term;n=n+2;count++;}sum=4*sum;printf("sum=%f,count=%d\n",sum,count); }6.9#include<stdio.h>#include<math.h>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=term*(1.0/n);sum=sum+term;n++;count++;}printf("sum=%f,count=%d\n",sum,count);}6.10#include<stdio.h>#include<math.h>main(){int x;for(x=100;x<=999;x++){if(x==pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3))printf("x=%d\n",x);}}6.11#include<stdio.h>main(){int i=0,n;long sum=0,term=1;printf("Inputn:");scanf("%d",&n);do{i++;term=term*i;sum=sum+term;}while(sum<n);printf("%d\n",i-1);}6.12#include<stdio.h>main(){int i,n,m,count=0,sum=0;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}6.13#include<stdio.h>main(){int i,n,m,count=0,sum=0;printf("Inputn:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0||m<0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}6.14#include<stdio.h>main(){int x,y,z;for(x=0;x<=17;x++){for(y=0;y<=25;y++){3*x+2*y+z==50;z=30-x-y;if(3*x+2*y+z==50&&x+y+z==30)printf("x=%d,y=%d,z=%d\n",x,y,z);}}}6.15#include<stdio.h>main(){int x,y;for(x=0;x<=98;x++){y=98-x;2*x+4*y==386;if(x+y==98&&2*x+4*y==386){printf("x=%d,y=%d\n",x,y);}}}6.16#include<stdio.h>main(){int x,y,z;for(x=0;x<=20;x++){for(y=0;y<=33;y++){3*y+5*x+z/3.0==100;z=100-x-y;if(5*x+3*y+z/3.0==100&&z+x+y==100){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}6.17#include<stdio.h>main(){int x,y,z;for(x=1;x<=9;x++){for(y=1;y<=17;y++){10*x+5*y+z==100;z=50-x-y;if(10*x+5*y+z==100&&x+y+z==50&&z>0){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}7.1#include<stdio.h>int Square(int i){return i*i;}int main(){int i=0;i=Square(i);for(;i<3;i++){static int i=1;i+=Square(i);printf("%d,",i);}printf("%d\n",i);return0;}7.2#include<stdio.h>int hour,minute,second;void update(){second++;if(second==60){second=0;minute++;}if(minute==60){minute=0;hour++;}if(hour==24)hour=0;}void display(){printf("%d,%d,%d\n",hour,minute,second); }void delay(){int t;for(t=0;t<100000000;t++);}int main(){int i;void updaye(),display(),delay();for(i=0;i<1000000;i++){update();display();delay();}return0;}7.3#include<stdio.h>int GetMax(int a,int b);int main(){int x,y,max;printf("Inputx,y:");scanf("%d,%d",&x,&y);max=GetMax(x,y);printf("max=%d\n",max);return0;}int GetMax(int m,int n){if(m>=n)return m;elsereturn n;}7.4#include<stdio.h>int LCM(int n,int m);int main(){int a,b;printf("Inputa,b:");scanf("%d,%d",&a,&b);printf("%d\n",LCM(a,b));return0;}int LCM(int n,int m){int x;int find=0;for(x=1;!find;x++){if(x%n==0&&x%m==0){find=1;}}return x-1;}7.5#include<stdio.h>long Fact(int n);int main(){int m,a;printf("Inputm:");scanf("%d",&m);for(a=1;a<=m;a++){printf("%d!=%ld\n",a,Fact(a));}return0;}long Fact(int n){int i;long result=1;for(i=2;i<=n;i++)result*=i;return result;}7.6#include<stdio.h>long Fact(int n);int main(){int m;long ret;printf("Inputm:");scanf("%d",&m);ret=Fact(m);printf("ret=%d\n",ret);return0;}long Fact(int n){int i;long result=1,sum=0;for(i=2;i<=n;i++){result*=i;sum=sum+result;}return sum;}7.7(1)#include<stdio.h>int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return0;}int Gcd(int a,int b){int t,min,find=0;min=a<b?a:b;t=min;for(t=min;!find;t--){a%t==0;b%t==0;if(a%t==0&&b%t==0)return t;}find=1;}7.7(2)#include<stdio.h> int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return0;}int Gcd(int a,int b){int r,temp;r=a%b;if(r==0)return b;elsedo{temp=b;b=r;a=temp;r=a%b;}while(r!=0);return b;}8.1(1)#include<stdio.h> void Func(int x){x=2;}int main(){int x=10;Func(x);printf("%d",x);return0;}8.1(2)#include<stdio.h> void Func(int b[]){int j;for(j=0;j<4;j++){b[j]=j;}}int main(){static int a[]={5,6,7,8},i;Func(a);for(i=0;i<4;i++){printf("%d",a[i]);}return0;}8.2(1)int PositiveNum(int a[],int n) {int i,count=0;for(i=0;i<n;i++){if(a[i]>0)count++;}return0;}8.2(2)void Fib(long f[],long n){int i;f[0]=0;f[1]=1;for(i=2;i<n;i++){f[i]=f[i-1]+f[i-2];}}8.2(3)#include<stdio.h>int main(){int a[10],n,max,min,maxPos,minPos;for(n=0;n<10;n++){scanf("%d",&a[n]);}max=min=a[0];maxPos=minPos=0;for(n=0;n<10;n++){if(a[n]>max){max=a[n];maxPos=n;}else if(a[n]<min){min=a[n];minPos=n;}}printf("max=%d,pos=%d\n",max,maxPos);printf("min=%d,pos=%d\n",min,minPos);return0;}8.3void DivArray(int*pArray,int n){int i;for(i=0;i<n;i++){pArray[i]/=pAttay[0];}}8.4#include<stdio.h>#define N40int FailNum(int score[],int n);void ReadScore(int score[],int n);int main(){int score[N],n;printf("Input n:");scanf("%d",&n);ReadScore(score,n);FailNum(score,n);printf("FailNum students are%d\n",FailNum(score,n));return0;}int FailNum(int score[],int n){int i,count=0;for(i=0;i<n;i++){if(score[i]<60)count++;}return count;}void ReadScore(int score[],int n){int i;printf("Input score:");for(i=0;i<n;i++){scanf("%d",&score[i]);}}8.5#include<stdio.h>#define N40int HighAver(int score[],int n);int ReadScore(int score[]);int main(){int score[N],n;n=ReadScore(score);printf("HighAver students are%d\n",HighAver(score,n));return0;}int HighAver(int score[],int n){int i,count=0,sum=0,aver;for(i=0;i<n;i++){sum=sum+score[i];aver=sum/n;}for(i=0;i<n;i++){if(score[i]>aver)count++;}return count;}int ReadScore(int score[]){int i=-1;do{i++;printf("Input score:");scanf("%d",&score[i]);}while(score[i]>=0);return i;}8.6#include<stdio.h>#define N40int ReadScore(int score[],long num[]);int FindMax(int score[],long num[],int n);int main(){int score[N],n,max,num,t;long num[N];t=FindMax(score,n);max=score[t];num=num[t];printf("max=%d,num=%d\n",max,num);return0;}int ReadScore(int score[],long num[]){int i=-1;do{i++;printf("Input student's ID and score:");scanf("%ld%d",&num[i],&score[i]);}while(num[i]>0&&score[i]>=0);return i;}int FindMax(int score[],long num[],int n){int max,i;max=score[0];for(i=1;i<n;i++){if(score[i]>max)max=score[i];}return i;}8.7#include<stdio.h>#define N40int Read(int a[]);int ChangeArry(int a[],int n);int main(){int a[N],n;printf("%d\n",ChangeArry(a,n));return0;}int Read(int a[]){int i;for(i=0;i<9;i++){printf("Input a:");scanf("%d",&a[i]);return i;}int ChangeArry(int a[],int n){int max,min,i,maxpos,minpos,term;max=min=score[0];for(i=1;i<n;i++){if(a[i]>max)max=score[i];maxpos=n;else(a[i]<min)min=a[i];minpos=n;temp=maxpos;maxpos=minpos;minpos=temp;}return a[i];}8.10#include<stdio.h>#define N5void main(){int a[N][N];int sum=0;int i,j;printf("请输入一个%d*%d的矩阵\n",N,N);for(i=0;i<N;i++){for(j=0;j<N;j++){scanf("%d",&a[i][j]);}}for(i=0;i<N;i++){for(j=0;j<N;j++){if(i==j||i+j==N-1)sum=sum+a[i][j];}}printf("对角线元素之和为：%d\n",sum);}8.11#include<stdio.h>#define N2#define M3void main(){int a[N][M],b[N][M];int i,j,sum1=0,sum2=0,sum=0;printf("请输入一个%d*%d的矩阵\n",N,M);for(i=0;i<N;i++){for(j=0;j<M;j++){scanf("%d",&a[i][j]);sum1=sum1+a[i][j];}}printf("请输入一个%d*%d的矩阵\n",N,M);for(i=0;i<N;i++){for(j=0;j<M;j++){scanf("%d",&b[i][j]);sum2=sum2+a[i][j];}}sum=sum1+sum2;printf("sum=%d\n",sum);}8.12#include<stdio.h>#define N7void YangHui(int a[N][N],int n);void main(){int i,j,n,b[N][N];printf("Input n:");scanf("%d",&n);YangHui(b,n);for(i=0;i<n;i++){for(j=0;j<=i;j++){printf("%4d",b[i][j]);}printf("\n");}}void YangHui(int a[N][N],int n){int i,j;for(i=0;i<n;i++){a[i][0]=1;a[i][i]=1;}for(i=2;i<n;i++){for(j=1;j<i;j++)a[i][j]=a[i-1][j-1]+a[i-1][j];}}8.13#include<stdio.h>#define N12void main(){int i;int f[N]={1,1};printf("%d:%d\n",0,f[0]);printf("%d:%d\n",1,f[1]);for(i=2;i<N;i++){f[i]=f[i-1]+f[i-2];printf("%d:%d\n",i+1,f[i]);}}8.14#include<stdio.h>#include<stdlib.h>#include<time.h>#define N6000void main(){int a[N],i;int b1=0,b2=0,b3=0,b4=0,b5=0,b6=0;float p1,p2,p3,p4,p5,p6;srand(time(NULL));for(i=0;i<N;i++){a[i]=rand()%6+1;printf("%3d",a[i]);if(a[i]==1)b1++;if(a[i]==2)b2++;if(a[i]==3)b3++;if(a[i]==4)b4++;if(a[i]==5)b5++;if(a[i]==6)b6++;p1=(float)(b1/6000.0);p2=(float)(b2/6000.0);p3=(float)(b3/6000.0);p4=(float)(b4/6000.0);p5=(float)(b5/6000.0);p6=(float)(b6/6000.0);}printf("骰子出现1的概率：%.2f\n",p1);printf("骰子出现2的概率：%.2f\n",p2);printf("骰子出现3的概率：%.2f\n",p3);printf("骰子出现4的概率：%.2f\n",p4);printf("骰子出现5的概率：%.2f\n",p5);printf("骰子出现6的概率：%.2f\n",p6);}9.1(1)void Swap(int*x,int*y){int*pTemp;//*pTemp未进行初始化，*pTemp指向哪里位置*pTemp=*x;*x=*y;*y=*pTemp;}9.1(2)void Swap(int*x,int*y){int*pTemp;pTemp=x;x=y;y=pTemp;}//错误，x,y没有指向类型9.2#include<stdio.h>int main(){int a[]={1,2,3,4,5};int*p=a;printf("%d,%d,%d,%d,%d,%d,%d\n",*p,*(++p),(*p)++,*p,*p--,--(*p),*p);return0;}9.3#include<stdio.h>void Swap(int*x,int*y);int main(){int a[6]={1,2,3,4,5,6},b[6]={11,22,33,44,55,66};int i;printf("Before Array\n");for(i=0;i<6;i++){printf("%d\n",a[i]);}for(i=0;i<6;i++){printf("%d\n",b[i]);}for(i=0;i<6;i++){Swap(&a[i],&b[i]);}printf("After Array\n");for(i=0;i<6;i++){printf("%d\n",a[i]);}for(i=0;i<6;i++){printf("%d\n",b[i]);}return0;}void Swap(int*x,int*y){int temp;temp=*x;*x=*y;*y=temp;}9.4#include<stdio.h>#define N10void FindMaxMin(int a[],int*pMaxa,int*pMaxnum,int*pMina,int*pMinnum);int main(){int a[N];int i,maxa,mina,maxnum,minnum;printf("Input a:");for(i=0;i<10;i++){scanf("%d",&a[i]);}FindMaxMin(a,&maxa,&maxnum,&mina,&minnum);printf("maxa=%d,maxnum=%d,mina=%d,minnum=%d\n",maxa,maxnum,mina,minnum);return0;}void FindMaxMin(int a[],int*pMaxa,int*pMaxnum,int*pMina,int*pMinnum){int i;*pMaxa=a[0];*pMina=a[0];*pMaxnum=0;*pMinnum=0;for(i=0;i<10;i++){if(a[i]>*pMaxa){*pMaxa=a[i];*pMaxnum=i;}else if(a[i]<*pMina){*pMina=a[i];*pMinnum=i;}}}10.1void MYStrcpy(char*dstStr,const char*srcStr){while((*dstStr++=*srcStr++)!='\0'){}}10.2#include<stdio.h>main(){char*a="main(){char*a=%c%s%c;printf(a,34,a,34);}";printf(a,34,a,34);} 10.3(1)unsigned int MyStrlen(char*p)main(){unsigned int len;len=0;for(;*pa!='\0';pa++){len++;}return len;}10.3(2)unsigned int MyStrlen(char s[]){char*p=s;while(*p!='\0'){p++;}return(p-*p);}10.3(3)int MyStrcmp(char*p1,char*p2){for(;*p1==*p2;p1++,p2++){if(*p1=='\0')return-1;}return1;}10.3(4)int MyStrcmp(char s[],char t[]){int i;for(i=0;s[i]==t[i];i++){if(s[i]=='\0')return0;}return i;}10.3(5)#include<stdio.h>#include<string.h>int main(){char password[7]="secret";char userInput[81];printf("Input Password:");scanf("%s",userInput);if(strcmp(userInput,password)==0)printf("Coorrect password!Welcome to the system...\n");else if(strcmp(userInput,password)<0)printf("Invalid password!user input<password...\n");elseprintf("Invalid password!user input>password...\n");return0;}10.4#include<stdio.h>#define N24unsigned int CountLetter(char str[]);int main(){char a[N];printf("Input a letter:\n");gets(a);printf("The length of the letter is:%d\n",CountLetter(a));return0;}unsigned int CountLetter(char str[]){char*p=str;int c=0,flag=0;while(*p!='\0'){if(*p!='')flag=1;else if(flag==1){c++;flag=0;}p++;}return c+1;}12.1#include<stdio.h>typedef struct data{int year;int month;int day;}DATA;typedef struct work{char a[14];char b[10];char c[6];}WORK;typedef struct student{char studentName[10];char studentSex;DATA birthday;WORK profession;}STUDENT;int main(){STUDENT stu={"王刚",'M',{1991,5,19},{"信息工程系","学习人员","学生"}};printf("stu:%2s%3c%6d/%02d/%02d%4s,%4s,%4s\n",stu.studentName,stu.studentSex,st u.birthday.year,stu.birthday.month,stu.birthday.day,stu.profession.a,stu.profession.b,stu.profession.c);return0;}12.4#include<stdio.h>#include<string.h>#define N10typedef struct people{char peopleName[10];}PEOPLE;int main(){int sum1=0,sum2=0,sum3=0,sum4=0;int i;char name[N][N];PEOPLE stu[5]={"zhang","li","wang"};printf("Enter their name:\n");for(i=0;i<10;i++){gets(name[i]);if(strcmp(name[i],stu[0].peopleName)==0)sum1++;else if(strcmp(name[i],stu[1].peopleName)==0) sum2++;else if(strcmp(name[i],stu[2].peopleName)==0) sum3++;elsesum4++;}printf("stu:%4s%2d\n",stu[i].peopleName,sum[j]);printf("stu:%4s%2d\n",stu[1].peopleName,sum2);printf("stu:%4s%2d\n",stu[2].peopleName,sum3);printf("%2d\n",sum4);return0;}。

2.2 #include<stdio.h>main(){float x=2.5,y=2.5,z=2.5;printf("x=%f\n",x);printf("y=%f\n",y);printf("z=%f\n",z);}3.1(1)#include<stdio.h>main(){int a=12,b=3;float x=18.5,y=4.6;printf("%f\n",(float)(a*b)/2);printf("%d\n",(int)x%(int)y);}3.1(2)#include<stdio.h>main(){int x=32,y=81,p,q;p=x++;q=--y;printf("%d %d\n",p,q); printf("%d %d\n",x,y); }3.2#include<stdio.h>main(){int x,b0,b1,b2,s;printf("Inputx:");scanf("%d",&x);b2=x/100;b1=(x-b2*100)/10;//或(x%100)/10;或x/10%10;b0=x%10;s=b0*100+b1*10+b2;printf("s=%d\n",s);}3.3#include<stdio.h>#include<math.h>main(){float rate=0.0225;float n,capital,deposit;printf("Input n,capital:");scanf("%f,%f",&n,&capital);deposit=capital*pow(1+rate,n);printf("deposit=%f\n",deposit);}3.4#include<stdio.h>#include<math.h>main(){float a, b, c;double x, y;printf("Input a, b, c:");scanf("%f %f %f", &a, &b, &c);x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}习题4 Array 4.1(1)#include<stdio.h>main(){char c1='a',c2='b',c3='c';printf("a%cb%cc%c\n",c1,c2,c3);}4.1(2)main(){int a=12,b=15;printf("a=%d%%,b=%d%%\n",a,b);}#include<stdio.h>main(){int a,b;printf("%d,%d\n",a,b);}4.2#include<stdio.h>main(){long a,b;float x,y;scanf("%d,%d\n",&a,&b);scanf("%f,%f\n",&x,&y);printf("a=%d,b=%d\n",a,b);printf("x=%f,b=%f\n",x,y); }5.1#include<stdio.h>main(){float a;printf("Input a:");scanf("%f",&a);if(a>=0){a=a;printf("a=%f\n",a);}else{a=-a;printf("a=%f\n",a);}}5.2#include<stdio.h>main(){int a;printf("Input a:");scanf("%d", &a);if(a%2==0)printf("a是偶数");}else{printf("a是奇数");}}5.3#include<stdio.h>#include<math.h>main(){float a,b,c,s,area;printf("Input a, b, c:");scanf("%f %f %f", &a, &b, &c);if(a+b>c&&a+c>b&&b+c>a){s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%f\n",area);}else{printf("不是三角形");}}5.4#include<stdio.h>#include<math.h>main(){float a,b,c,x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a==0){printf("该方程不是一元二次方程\n");}if(b*b-4*a*c>0){x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}else if(b*b-4*a*c==0)x=-b/(2*a);y=-b/(2*a);printf("x=%f,y=%f\n",x,y);}else{printf("该方程无实根\n");}}5.5#include<stdio.h>main(){int year,flag;printf("Input a year:");scanf("%d",&year);if(year%4==0&&year%400!=0||year%400==0){flag=1;}else{flag=0;}if(flag==1){printf("%d is a leap year!\n",year);}else{printf("%d is not a leap year!\n",year);}}5.6#include<stdio.h>main(){int year,flag;printf("Input a year:");scanf("%d",&year);flag=year%400==0||year%4==0&&year%100!=0?1:0;if(flag==1&&flag!=0){printf("%d is a leap year!\n",year);}else{printf("%d is not a leap year!\n",year);}}5.7#include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>='a'&&ch<='z'){ch=getchar();ch=ch-32;printf("%c,%d\n",ch,ch);}else if(ch>='A'&&ch<='Z'){ch=getchar();ch=ch+32;printf("%c,%d\n",ch,ch);}else{printf("%c",ch);}}5.8#include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>=48&&ch<=57){printf("ch是数字字符\n");}else if(ch>=65&&ch<=90){printf("ch是大写字母\n");}else if(ch>=97&&ch<=122){printf("ch是小写字母\n");}else if(ch==32){printf("ch是空格\n");}else{printf("ch是其他字符\n");}}5.9#include<stdio.h>main(){int score,grade;printf("Input score:");scanf("%d",&score);grade=score/10;if(score<0||score>100){printf("Input error\n");}if(score>=90&&score<=100){printf("%d--A\n",score);}else if(score>=80&&score<90){printf("%d--B\n",score);}else if(score>=70&&score<80){printf("%d--C\n",score);}else if(score>=60&&score<70){printf("%d--D\n",score);}else if(score>=0&&score<60){printf("%d--E\n",score);}}5.10#include<stdio.h>main(){int year,month;printf("Input year,month:");scanf("%d,%d",&year,&month);if(month>12||month<=0){printf("error month\n");}else{switch(year,month){case12:case10:case8:case7:case5:case3:case1:printf("31天\n");break;case11:case9:case6:case4:printf("30天\n");break;case2:if(year%4==0&&year!=0||year%400==0){printf("29天\n");}else{printf("28天\n");}break;default:printf("Input error\n");}}}6.1(1)#include<stdio.h>main(){int i,j,k;char space='';for(i=1;i<=4;i++){for(j=1;j<=i;j++){printf("%c",space);}for(k=1;k<=6;k++){printf("*");}printf("\n");}}6.1(2)#include<stdio.h>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0)continue;k--;}printf("k=%d\n,n=%d\n",k,n);}6.1(3)#include<stdio.h>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0)break;k--;}printf("k=%d,n=%d\n",k,n);}6.2(1)#include<stdio.h>main(){int i,sum=0;for(i=1;i<=101;i++){sum=sum+i;}printf("sum=%d\n",sum);}6.2(2)#include<stdio.h>main(){long i;long term,sum=0;for(i=1;i<=101;i=i+2){term=i*(i+1)*(i+2);sum=sum+term;}printf("sum=%ld\n",sum);}6.2(4)#include<stdio.h>#include<math.h>main(){int n=1;float term=1.0,sign=1,sum=0;while(term<=-1e-4||term>=1e-4){term=1.0/sign;sum=sum+term;sign=sign+n;n++;}printf("sum=%f\n",sum);}6.2(5)#include<stdio.h>#include<math.h>main(){int n=1,count=1;float x;double sum,term;printf("Input x:");scanf("%f",&x);sum=x;term=x;do{term=-term*x*x/((n+1)*(n+2));sum=sum+term;n=n+2;count++;}while(fabs(term)>=1e-5);printf("sin(x)=%f,count=%d\n",sum,count);}6.3#include<stdio.h>main(){int x=1,find=0;while(!find){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;x++;}}}/*int x,find=0;for(x=1;!find;x++){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;}}}*/6.4#include<stdio.h>main(){int i,n;long p=1,m=1;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){p=i*i;m=i*i*i;printf("p=%d,m=%d\n",i,p,i,m);}}6.5#include<stdio.h>main(){float c,f;for(c=-40;c<=110;c=c+10){f=9/5*c+32;printf("f=%f\n",f);}}6.6#include<stdio.h>#include<math.h>main(){int n;double c=0.01875,x;do{x=x*pow(1+c,12)-1000;n++;}while(x>0);printf("x=%d\n",x);}6.7#include<stdio.h>main(){int n=0;float a=100.0,c;printf("Inputc:");scanf("%f",&c);do{a=a*(1+c);n++;}while(a<=200);printf("n=%d\n",n);}6.8#include<stdio.h>#include<math.h>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=pow(-1,count)*(1.0/(n+2));sum=sum+term;n=n+2;count++;}sum=4*sum;printf("sum=%f,count=%d\n",sum,count); }6.9#include<stdio.h>#include<math.h>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=term*(1.0/n);sum=sum+term;n++;count++;}printf("sum=%f,count=%d\n",sum,count);}6.10#include<stdio.h>#include<math.h>main(){int x;for(x=100;x<=999;x++){if(x==pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3))printf("x=%d\n",x);}}6.11#include<stdio.h>main(){int i=0,n;long sum=0,term=1;printf("Inputn:");scanf("%d",&n);do{i++;term=term*i;sum=sum+term;}while(sum<n);printf("%d\n",i-1);}6.12#include<stdio.h>main(){int i,n,m,count=0,sum=0;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}6.13#include<stdio.h>main(){int i,n,m,count=0,sum=0;printf("Inputn:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0||m<0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}6.14#include<stdio.h>main(){int x,y,z;for(x=0;x<=17;x++){for(y=0;y<=25;y++){3*x+2*y+z==50;z=30-x-y;if(3*x+2*y+z==50&&x+y+z==30)printf("x=%d,y=%d,z=%d\n",x,y,z);}}}6.15#include<stdio.h>main(){int x,y;for(x=0;x<=98;x++){y=98-x;2*x+4*y==386;if(x+y==98&&2*x+4*y==386){printf("x=%d,y=%d\n",x,y);}}}6.16#include<stdio.h>main(){int x,y,z;for(x=0;x<=20;x++){for(y=0;y<=33;y++){3*y+5*x+z/3.0==100;z=100-x-y;if(5*x+3*y+z/3.0==100&&z+x+y==100){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}6.17#include<stdio.h>main(){int x,y,z;for(x=1;x<=9;x++){for(y=1;y<=17;y++){10*x+5*y+z==100;z=50-x-y;if(10*x+5*y+z==100&&x+y+z==50&&z>0){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}7.1#include<stdio.h>int Square(int i){return i*i;}int main(){int i=0;i=Square(i);for(;i<3;i++){static int i=1;i+=Square(i);printf("%d,",i);}printf("%d\n",i);return0;}7.2#include<stdio.h>int hour,minute,second;void update(){second++;if(second==60){second=0;minute++;}if(minute==60){minute=0;hour++;}if(hour==24)hour=0;}void display(){printf("%d,%d,%d\n",hour,minute,second); }void delay(){int t;for(t=0;t<100000000;t++);}int main(){int i;void updaye(),display(),delay();for(i=0;i<1000000;i++){update();display();delay();}return0;}7.3#include<stdio.h>int GetMax(int a,int b);int main(){int x,y,max;printf("Inputx,y:");scanf("%d,%d",&x,&y);max=GetMax(x,y);printf("max=%d\n",max);return0;}int GetMax(int m,int n){if(m>=n)return m;elsereturn n;}7.4#include<stdio.h>int LCM(int n,int m);int main(){int a,b;printf("Inputa,b:");scanf("%d,%d",&a,&b);printf("%d\n",LCM(a,b));return0;}int LCM(int n,int m){int x;int find=0;for(x=1;!find;x++){if(x%n==0&&x%m==0){find=1;}}return x-1;}7.5#include<stdio.h>long Fact(int n);int main(){int m,a;printf("Inputm:");scanf("%d",&m);for(a=1;a<=m;a++){printf("%d!=%ld\n",a,Fact(a));}return0;}long Fact(int n){int i;long result=1;for(i=2;i<=n;i++)result*=i;return result;}7.6#include<stdio.h>long Fact(int n);int main(){int m;long ret;printf("Inputm:");scanf("%d",&m);ret=Fact(m);printf("ret=%d\n",ret);return0;}long Fact(int n){int i;long result=1,sum=0;for(i=2;i<=n;i++){result*=i;sum=sum+result;}return sum;}7.7(1)#include<stdio.h>int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return0;}int Gcd(int a,int b){int t,min,find=0;min=a<b?a:b;t=min;for(t=min;!find;t--){a%t==0;b%t==0;if(a%t==0&&b%t==0)return t;}find=1;}7.7(2)#include<stdio.h> int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return0;}int Gcd(int a,int b){int r,temp;r=a%b;if(r==0)return b;elsedo{temp=b;b=r;a=temp;r=a%b;}while(r!=0);return b;}8.1(1)#include<stdio.h> void Func(int x){x=2;}int main(){int x=10;Func(x);printf("%d",x);return0;}8.1(2)#include<stdio.h> void Func(int b[]){int j;for(j=0;j<4;j++){b[j]=j;}}int main(){static int a[]={5,6,7,8},i;Func(a);for(i=0;i<4;i++){printf("%d",a[i]);}return0;}8.2(1)int PositiveNum(int a[],int n) {int i,count=0;for(i=0;i<n;i++){if(a[i]>0)count++;}return0;}8.2(2)void Fib(long f[],long n){int i;f[0]=0;f[1]=1;for(i=2;i<n;i++){f[i]=f[i-1]+f[i-2];}}8.2(3)#include<stdio.h>int main(){int a[10],n,max,min,maxPos,minPos;for(n=0;n<10;n++){scanf("%d",&a[n]);}max=min=a[0];maxPos=minPos=0;for(n=0;n<10;n++){if(a[n]>max){max=a[n];maxPos=n;}else if(a[n]<min){min=a[n];minPos=n;}}printf("max=%d,pos=%d\n",max,maxPos);printf("min=%d,pos=%d\n",min,minPos);return0;}8.3void DivArray(int*pArray,int n){int i;for(i=0;i<n;i++){pArray[i]/=pAttay[0];}}8.4#include<stdio.h>#define N40int FailNum(int score[],int n);void ReadScore(int score[],int n);int main(){int score[N],n;printf("Input n:");scanf("%d",&n);ReadScore(score,n);FailNum(score,n);printf("FailNum students are%d\n",FailNum(score,n));return0;}int FailNum(int score[],int n){int i,count=0;for(i=0;i<n;i++){if(score[i]<60)count++;}return count;}void ReadScore(int score[],int n){int i;printf("Input score:");for(i=0;i<n;i++){scanf("%d",&score[i]);}}8.5#include<stdio.h>#define N40int HighAver(int score[],int n);int ReadScore(int score[]);int main(){int score[N],n;n=ReadScore(score);printf("HighAver students are%d\n",HighAver(score,n));return0;}int HighAver(int score[],int n){int i,count=0,sum=0,aver;for(i=0;i<n;i++){sum=sum+score[i];aver=sum/n;}for(i=0;i<n;i++){if(score[i]>aver)count++;}return count;}int ReadScore(int score[]){int i=-1;do{i++;printf("Input score:");scanf("%d",&score[i]);}while(score[i]>=0);return i;}8.6#include<stdio.h>#define N40int ReadScore(int score[],long num[]);int FindMax(int score[],long num[],int n);int main(){int score[N],n,max,num,t;long num[N];t=FindMax(score,n);max=score[t];num=num[t];printf("max=%d,num=%d\n",max,num);return0;}int ReadScore(int score[],long num[]){int i=-1;do{i++;printf("Input student's ID and score:");scanf("%ld%d",&num[i],&score[i]);}while(num[i]>0&&score[i]>=0);return i;}int FindMax(int score[],long num[],int n){int max,i;max=score[0];for(i=1;i<n;i++){if(score[i]>max)max=score[i];}return i;}8.7#include<stdio.h>#define N40int Read(int a[]);int ChangeArry(int a[],int n);int main(){int a[N],n;printf("%d\n",ChangeArry(a,n));return0;}int Read(int a[]){int i;for(i=0;i<9;i++){printf("Input a:");scanf("%d",&a[i]);return i;}int ChangeArry(int a[],int n){int max,min,i,maxpos,minpos,term;max=min=score[0];for(i=1;i<n;i++){if(a[i]>max)max=score[i];maxpos=n;else(a[i]<min)min=a[i];minpos=n;temp=maxpos;maxpos=minpos;minpos=temp;}return a[i];}8.10#include<stdio.h>#define N5void main(){int a[N][N];int sum=0;int i,j;printf("请输入一个%d*%d的矩阵\n",N,N);for(i=0;i<N;i++){for(j=0;j<N;j++){scanf("%d",&a[i][j]);}}for(i=0;i<N;i++){for(j=0;j<N;j++){if(i==j||i+j==N-1)sum=sum+a[i][j];}}printf("对角线元素之和为：%d\n",sum);}8.11#include<stdio.h>#define N2#define M3void main(){int a[N][M],b[N][M];int i,j,sum1=0,sum2=0,sum=0;printf("请输入一个%d*%d的矩阵\n",N,M);for(i=0;i<N;i++){for(j=0;j<M;j++){scanf("%d",&a[i][j]);sum1=sum1+a[i][j];}}printf("请输入一个%d*%d的矩阵\n",N,M);for(i=0;i<N;i++){for(j=0;j<M;j++){scanf("%d",&b[i][j]);sum2=sum2+a[i][j];}}sum=sum1+sum2;printf("sum=%d\n",sum);}8.12#include<stdio.h>#define N7void YangHui(int a[N][N],int n);void main(){int i,j,n,b[N][N];printf("Input n:");scanf("%d",&n);YangHui(b,n);for(i=0;i<n;i++){for(j=0;j<=i;j++){printf("%4d",b[i][j]);}printf("\n");}}void YangHui(int a[N][N],int n){int i,j;for(i=0;i<n;i++){a[i][0]=1;a[i][i]=1;}for(i=2;i<n;i++){for(j=1;j<i;j++)a[i][j]=a[i-1][j-1]+a[i-1][j];}}8.13#include<stdio.h>#define N12void main(){int i;int f[N]={1,1};printf("%d:%d\n",0,f[0]);printf("%d:%d\n",1,f[1]);for(i=2;i<N;i++){f[i]=f[i-1]+f[i-2];printf("%d:%d\n",i+1,f[i]);}}8.14#include<stdio.h>#include<stdlib.h>#include<time.h>#define N6000void main(){int a[N],i;int b1=0,b2=0,b3=0,b4=0,b5=0,b6=0;float p1,p2,p3,p4,p5,p6;srand(time(NULL));for(i=0;i<N;i++){a[i]=rand()%6+1;printf("%3d",a[i]);if(a[i]==1)b1++;if(a[i]==2)b2++;if(a[i]==3)b3++;if(a[i]==4)b4++;if(a[i]==5)b5++;if(a[i]==6)b6++;p1=(float)(b1/6000.0);p2=(float)(b2/6000.0);p3=(float)(b3/6000.0);p4=(float)(b4/6000.0);p5=(float)(b5/6000.0);p6=(float)(b6/6000.0);}printf("骰子出现1的概率：%.2f\n",p1);printf("骰子出现2的概率：%.2f\n",p2);printf("骰子出现3的概率：%.2f\n",p3);printf("骰子出现4的概率：%.2f\n",p4);printf("骰子出现5的概率：%.2f\n",p5);printf("骰子出现6的概率：%.2f\n",p6);}9.1(1)void Swap(int*x,int*y){int*pTemp;//*pTemp未进行初始化，*pTemp指向哪里位置*pTemp=*x;*x=*y;*y=*pTemp;}9.1(2)void Swap(int*x,int*y){int*pTemp;pTemp=x;x=y;y=pTemp;}//错误，x,y没有指向类型9.2#include<stdio.h>int main(){int a[]={1,2,3,4,5};int*p=a;printf("%d,%d,%d,%d,%d,%d,%d\n",*p,*(++p),(*p)++,*p,*p--,--(*p),*p);return0;}9.3#include<stdio.h>void Swap(int*x,int*y);int main(){int a[6]={1,2,3,4,5,6},b[6]={11,22,33,44,55,66};int i;printf("Before Array\n");for(i=0;i<6;i++){printf("%d\n",a[i]);}for(i=0;i<6;i++){printf("%d\n",b[i]);}for(i=0;i<6;i++){Swap(&a[i],&b[i]);}printf("After Array\n");for(i=0;i<6;i++){printf("%d\n",a[i]);}for(i=0;i<6;i++){printf("%d\n",b[i]);}return0;}void Swap(int*x,int*y){int temp;temp=*x;*x=*y;*y=temp;}9.4#include<stdio.h>#define N10void FindMaxMin(int a[],int*pMaxa,int*pMaxnum,int*pMina,int*pMinnum);int main(){int a[N];int i,maxa,mina,maxnum,minnum;printf("Input a:");for(i=0;i<10;i++){scanf("%d",&a[i]);}FindMaxMin(a,&maxa,&maxnum,&mina,&minnum);printf("maxa=%d,maxnum=%d,mina=%d,minnum=%d\n",maxa,maxnum,mina,minnum);return0;}void FindMaxMin(int a[],int*pMaxa,int*pMaxnum,int*pMina,int*pMinnum){int i;*pMaxa=a[0];*pMina=a[0];*pMaxnum=0;*pMinnum=0;for(i=0;i<10;i++){if(a[i]>*pMaxa){*pMaxa=a[i];*pMaxnum=i;}else if(a[i]<*pMina){*pMina=a[i];*pMinnum=i;}}}10.1void MYStrcpy(char*dstStr,const char*srcStr){while((*dstStr++=*srcStr++)!='\0'){}}10.2#include<stdio.h>main(){char*a="main(){char*a=%c%s%c;printf(a,34,a,34);}";printf(a,34,a,34);} 10.3(1)unsigned int MyStrlen(char*p)main(){unsigned int len;len=0;for(;*pa!='\0';pa++){len++;}return len;}10.3(2)unsigned int MyStrlen(char s[]){char*p=s;while(*p!='\0'){p++;}return(p-*p);}10.3(3)int MyStrcmp(char*p1,char*p2){for(;*p1==*p2;p1++,p2++){if(*p1=='\0')return-1;}return1;}10.3(4)int MyStrcmp(char s[],char t[]){int i;for(i=0;s[i]==t[i];i++){if(s[i]=='\0')return0;}return i;}10.3(5)#include<stdio.h>#include<string.h>int main(){char password[7]="secret";char userInput[81];printf("Input Password:");scanf("%s",userInput);if(strcmp(userInput,password)==0)printf("Coorrect password!Welcome to the system...\n");else if(strcmp(userInput,password)<0)printf("Invalid password!user input<password...\n");elseprintf("Invalid password!user input>password...\n");return0;}10.4#include<stdio.h>#define N24unsigned int CountLetter(char str[]);int main(){char a[N];printf("Input a letter:\n");gets(a);printf("The length of the letter is:%d\n",CountLetter(a));return0;}unsigned int CountLetter(char str[]){char*p=str;int c=0,flag=0;while(*p!='\0'){if(*p!='')flag=1;else if(flag==1){c++;flag=0;}p++;}return c+1;}12.1#include<stdio.h>typedef struct data{int year;int month;int day;}DATA;typedef struct work{char a[14];char b[10];char c[6];}WORK;typedef struct student{char studentName[10];char studentSex;DATA birthday;WORK profession;}STUDENT;int main(){STUDENT stu={"王刚",'M',{1991,5,19},{"信息工程系","学习人员","学生"}};printf("stu:%2s%3c%6d/%02d/%02d%4s,%4s,%4s\n",stu.studentName,stu.studentSex,st u.birthday.year,stu.birthday.month,stu.birthday.day,stu.profession.a,stu.profession.b,stu.profession.c);return0;}12.4#include<stdio.h>#include<string.h>#define N10typedef struct people{char peopleName[10];}PEOPLE;int main(){int sum1=0,sum2=0,sum3=0,sum4=0;int i;char name[N][N];PEOPLE stu[5]={"zhang","li","wang"};printf("Enter their name:\n");for(i=0;i<10;i++){gets(name[i]);if(strcmp(name[i],stu[0].peopleName)==0)sum1++;else if(strcmp(name[i],stu[1].peopleName)==0) sum2++;else if(strcmp(name[i],stu[2].peopleName)==0) sum3++;elsesum4++;}printf("stu:%4s%2d\n",stu[i].peopleName,sum[j]);printf("stu:%4s%2d\n",stu[1].peopleName,sum2);printf("stu:%4s%2d\n",stu[2].peopleName,sum3);printf("%2d\n",sum4);return0;}精品文档。

printf("y=%f\n",y);printf("z=%f\n",z);}3.1(1)main(){}3.1(2)main(){}3.2main(){int x,b0,b1,b2,s;printf("Inputx:");scanf("%d",&x);b2=x/100;b1=(x-b2*100)/10;//或(x%100)/10;或x/10%10;b0=x%10;s=b0*100+b1*10+b2;printf("s=%d\n",s);}3.3#include<stdio.h>#include<math.h>main(){float rate=0.0225;float n,capital,deposit;printf("Input n,capital:");scanf("%f,%f",&n,&capital);deposit=capital*pow(1+rate,n);printf("deposit=%f\n",deposit); }3.4main(){}习题44.1(1)main(){}4.1(2)main(){}4.1(3)main(){}4.2#include<stdio.h>main(){long a,b;float x,y;scanf("%d,%d\n",&a,&b);scanf("%f,%f\n",&x,&y);printf("a=%d,b=%d\n",a,b);printf("x=%f,b=%f\n",x,y); }5.1main(){{}{}}5.2main(){intscanf("%d", &a);if(a%2==0){printf("a是偶数");}else{printf("a是奇数");}}5.3#include<stdio.h>#include<math.h>main(){float a,b,c,s,area;printf("Input a, b, c:");scanf("%f %f %f", &a, &b, &c);if(a+b>c&&a+c>b&&b+c>a){s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%f\n",area);}{}}5.4main(){{}{}else if(b*b-4*a*c==0){x=-b/(2*a);y=-b/(2*a);printf("x=%f,y=%f\n",x,y);}else{printf("该方程无实根\n");}}5.5#include<stdio.h>main(){int year,flag;printf("Input a year:");scanf("%d",&year);if(year%4==0&&year%400!=0||year%400==0) {flag=1;}else{}{}{}}5.6main(){int{}else{printf("%d is not a leap year!\n",year);}}5.7#include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>='a'&&ch<='z'){ch=getchar();ch=ch-32;printf("%c,%d\n",ch,ch);}else if(ch>='A'&&ch<='Z'){ch=getchar();ch=ch+32;printf("%c,%d\n",ch,ch);}{}}5.8#include<stdio.h>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>=48&&ch<=57){printf("ch是数字字符\n");grade=score/10;if(score<0||score>100){printf("Input error\n");}if(score>=90&&score<=100){printf("%d--A\n",score);}else if(score>=80&&score<90){printf("%d--B\n",score);}else if(score>=70&&score<80){printf("%d--C\n",score);}else if(score>=60&&score<70){printf("%d--D\n",score);}case3:case1:printf("31天\n");break;case11:case9:case6:case4:printf("30天\n");break;case2:if(year%4==0&&year!=0||year%400==0){printf("29天\n");}else{printf("28天\n");}break;main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0)continue;k--;}printf("k=%d\n,n=%d\n",k,n);}6.1(3)#include<stdio.h>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0)break;k--;}printf("k=%d,n=%d\n",k,n);main(){int n=1;float term=1.0,sign=1,sum=0;while(term<=-1e-4||term>=1e-4){term=1.0/sign;sum=sum+term;sign=sign+n;n++;}printf("sum=%f\n",sum);}6.2(5)#include<stdio.h>#include<math.h>main(){int n=1,count=1;float x;}}/*int x,find=0;for(x=1;!find;x++){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;}}}*/6.4#include<stdio.h>main(){int i,n;long p=1,m=1;printf("Input n:");scanf("%d",&n);x=x*pow(1+c,12)-1000;n++;}while(x>0);printf("x=%d\n",x);}6.7#include<stdio.h>main(){int n=0;float a=100.0,c;printf("Inputc:");scanf("%f",&c);do{a=a*(1+c);n++;}while(a<=200);printf("n=%d\n",n);}term=term*(1.0/n);sum=sum+term;n++;count++;}printf("sum=%f,count=%d\n",sum,count); }6.10#include<stdio.h>#include<math.h>main(){int x;for(x=100;x<=999;x++){if(x==pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3))printf("x=%d\n",x);}}{sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}6.13#include<stdio.h>main(){int i,n,m,count=0,sum=0;printf("Inputn:");scanf("%d",&n);for(i=1;i<=n;i++){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}6.15#include<stdio.h>main(){int x,y;for(x=0;x<=98;x++){y=98-x;2*x+4*y==386;if(x+y==98&&2*x+4*y==386){printf("x=%d,y=%d\n",x,y);}}}6.16#include<stdio.h>{10*x+5*y+z==100;z=50-x-y;if(10*x+5*y+z==100&&x+y+z==50&&z>0){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}7.1#include<stdio.h>int Square(int i){return i*i;}int main(){int i=0;i=Square(i);hour=0;}void display(){printf("%d,%d,%d\n",hour,minute,second); }void delay(){int t;for(t=0;t<100000000;t++);}int main(){int i;void updaye(),display(),delay();for(i=0;i<1000000;i++){update();int main(){int a,b;printf("Inputa,b:");scanf("%d,%d",&a,&b);printf("%d\n",LCM(a,b));return0;}int LCM(int n,int m){int x;int find=0;for(x=1;!find;x++){if(x%n==0&&x%m==0){find=1;}long Fact(int n);int main(){int m;long ret;printf("Inputm:");scanf("%d",&m);ret=Fact(m);printf("ret=%d\n",ret);return0;}long Fact(int n){int i;long result=1,sum=0;for(i=2;i<=n;i++){result*=i;sum=sum+result;find=1;}7.7(2)#include<stdio.h> int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return0;}int Gcd(int a,int b){int r,temp;r=a%b;if(r==0)return b;else{b[j]=j;}}int main(){static int a[]={5,6,7,8},i;Func(a);for(i=0;i<4;i++){printf("%d",a[i]);}return0;}8.2(1)int PositiveNum(int a[],int n) {int i,count=0;for(i=0;i<n;i++){{if(a[n]>max){max=a[n];maxPos=n;}else if(a[n]<min){min=a[n];minPos=n;}}printf("max=%d,pos=%d\n",max,maxPos);printf("min=%d,pos=%d\n",min,minPos);return0;}8.3void DivArray(int*pArray,int n){int i;count++;}return count;}void ReadScore(int score[],int n){int i;printf("Input score:");for(i=0;i<n;i++){scanf("%d",&score[i]);}}8.5#include<stdio.h>#define N40int HighAver(int score[],int n);int ReadScore(int score[]);int main(){printf("Input score:");scanf("%d",&score[i]);}while(score[i]>=0);return i;}8.6#include<stdio.h>#define N40int ReadScore(int score[],long num[]); int FindMax(int score[],long num[],int n);int main(){int score[N],n,max,num,t;long num[N];t=FindMax(score,n);max=score[t];num=num[t];printf("max=%d,num=%d\n",max,num);return0;}int main(){int a[N],n;printf("%d\n",ChangeArry(a,n));return0;}int Read(int a[]){int i;for(i=0;i<9;i++){printf("Input a:");scanf("%d",&a[i]);return i;}int ChangeArry(int a[],int n){int max,min,i,maxpos,minpos,term;max=min=score[0];for(j=0;j<N;j++){scanf("%d",&a[i][j]);}}for(i=0;i<N;i++){for(j=0;j<N;j++){if(i==j||i+j==N-1)sum=sum+a[i][j];}}printf("对角线元素之和为：%d\n",sum); }8.11#include<stdio.h>#define N2#define M3void main()#define N7void YangHui(int a[N][N],int n);void main(){int i,j,n,b[N][N];printf("Input n:");scanf("%d",&n);YangHui(b,n);for(i=0;i<n;i++){for(j=0;j<=i;j++){printf("%4d",b[i][j]);}printf("\n");}}void YangHui(int a[N][N],int n){}8.14#include<stdio.h>#include<stdlib.h>#include<time.h>#define N6000void main(){int a[N],i;int b1=0,b2=0,b3=0,b4=0,b5=0,b6=0;float p1,p2,p3,p4,p5,p6;srand(time(NULL));for(i=0;i<N;i++){a[i]=rand()%6+1;printf("%3d",a[i]);if(a[i]==1)b1++;if(a[i]==2)b2++;*pTemp=*x;*x=*y;*y=*pTemp;}9.1(2)void Swap(int*x,int*y) {int*pTemp;pTemp=x;x=y;y=pTemp;}//错误，x,y没有指向类型9.2#include<stdio.h>int main(){int a[]={1,2,3,4,5};int*p=a;printf("%d,%d,%d,%d,%d,%d,%d\n",*p,*(++p),(*p)++,*p,*p--,--(*p),*p);return0;for(i=0;i<6;i++){printf("%d\n",b[i]);}return0;}void Swap(int*x,int*y){int temp;temp=*x;*x=*y;*y=temp;}9.4#include<stdio.h>#define N10void FindMaxMin(int a[],int*pMaxa,int*pMaxnum,int*pMina,int*pMinnum); int main(){int a[N];{*pMina=a[i];*pMinnum=i;}}}10.1void MYStrcpy(char*dstStr,const char*srcStr){while((*dstStr++=*srcStr++)!='\0'){}}10.2#include<stdio.h>main(){char*a="main(){char*a=%c%s%c;printf(a,34,a,34);}";printf(a,34,a,34);} 10.3(1)unsigned int MyStrlen(char*p)main(){unsigned int len;{int i;for(i=0;s[i]==t[i];i++){if(s[i]=='\0')return0;}return i;}10.3(5)#include<stdio.h>#include<string.h>int main(){char password[7]="secret";char userInput[81];printf("Input Password:");scanf("%s",userInput);if(strcmp(userInput,password)==0)printf("Coorrect password!Welcome to the system...\n");else if(strcmp(userInput,password)<0){c++;flag=0;}p++;}return c+1;}12.1#include<stdio.h>typedef struct data{int year;int month;int day;}DATA;typedef struct work{char a[14];char b[10];int sum1=0,sum2=0,sum3=0,sum4=0;int i;char name[N][N];PEOPLE stu[5]={"zhang","li","wang"};printf("Enter their name:\n");for(i=0;i<10;i++){gets(name[i]);if(strcmp(name[i],stu[0].peopleName)==0) sum1++;else if(strcmp(name[i],stu[1].peopleName)==0) sum2++;else if(strcmp(name[i],stu[2].peopleName)==0) sum3++;elsesum4++;}printf("stu:%4s%2d\n",stu[i].peopleName,sum[j]);。

#include<>main(){float x=,y=,z=;printf("x=%f\n",x);printf("y=%f\n",y);printf("z=%f\n",z);}(1) #include<>main(){int a=12,b=3;float x=,y=;printf("%d\n",(float)(a*b)/2);printf("%d\n",(int)x%(int)y);}#include<>main(){int x,b0,b1,b2,s;printf("Inputx:");scanf("%d",&x);b2=x/100;b1=(x-b2*100)/10;b0=x%10;s=b0*100+b1*10+b2;printf("s=%d\n",s);}#include<>#include<>main(){float rate=;float n,capital,deposit;printf("Input n,capital:");scanf("%f,%f",&n,&capital);deposit=capital*pow(1+rate,n);printf("deposit=%f\n",deposit); }#include<>#include<>main(){float a,b,c;double x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}(1) #include<>main(){char c1='a',c2='b',c3='c';printf("a%cb%cc%c\n",c1,c2,c3); }(2) #include<>main(){int a=12,b=15;printf("a=%d%%,b=%d%%\n",a,b); }(3) #include<>main(){int a,b;scanf("%2d%*2s%2d",&a,&b);printf("%d,%d\n",a,b);}#include<>main(){long a,b;float x,y;scanf("%d,%d\n",&a,&b);scanf("%f,%f\n",&x,&y);printf("a=%d,b=%d\n",a,b);printf("x=%f,b=%f\n",x,y);}#include<>main(){float a;printf("Innputa:");scanf("%f",&a);if(a>=0){a=a;printf("a=%f\n",a);}else{a=-a;printf("a=%f\n",a);}}#include<>main(){int a;printf("Inputa:");scanf("%d",&a);if(a%2==0){printf("a是偶数");}else{printf("a是奇数");}}#include<>#include<>main(){float a,b,c,s,area;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a+b>c&&a+c>b&&b+c>a){s=(a+b+c)/2;area=(float)sqrt(s*(s-a)*(s-b)*(s-c));printf("area=%f\n",area);}else{printf("不是三角形");}}#include<>#include<>{float a,b,c,x,y;printf("Inputa,b,c:");scanf("%f,%f,%f",&a,&b,&c);if(a==0){printf("该方程不是一元二次方程\n");}if(b*b-4*a*c>0){x=(-b+sqrt(b*b-4*a*c))/(2*a);y=(-b-sqrt(b*b-4*a*c))/(2*a);printf("x=%f,y=%f\n",x,y);}else if(b*b-4*a*c==0){x=-b/(2*a);y=-b/(2*a);printf("x=%f,y=%f\n",x,y);}else{printf("该方程无实根\n");}}#include<>main(){int year,flag;printf("Input a year:");scanf("%d",&year);if(year%4==0&&year%400!=0||year%400==0) {flag=1;}else{flag=0;}if(flag==1){printf("%d is a leap year !\n",year);}{printf("%d is not a leap year !\n",year);}}#include<>main(){int year,flag;printf("Input a year:");scanf("%d",&year);flag=year%400==0||year%4==0&&year%100!=01:0;if(flag==1&&flag!=0){printf("%d is a leap year !\n",year);}else{printf("%d is not a leap year !\n",year);}}#include<>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>='a'&&ch<='z'){ch=getchar();ch=ch-32;printf("%c,%d\n",ch,ch);}else if(ch>='A'&&ch<='Z'){ch=getchar();ch=ch+32;printf("%c,%d\n",ch,ch);}else{printf("%c",ch);}}#include<>main(){char ch;printf("Inputch:");scanf("%c",&ch);if(ch>=48&&ch<=57){printf("ch是数字字符\n");}else if(ch>=65&&ch<=90){printf("ch是大写字母\n");}else if(ch>=97&&ch<=122){printf("ch是小写字母\n");}else if(ch==32){printf("ch是空格\n");}else{printf("ch是其他字符\n");}}#include<>main(){int score,grade;printf("Input score:");scanf("%d",&score);grade=score/10;if(score<0||score>100){printf("Input error\n");}if(score>=90&&score<=100){printf("%d--A\n",score);}else if(score>=80&&score<90){printf("%d--B\n",score);}else if(score>=70&&score<80){printf("%d--C\n",score);}else if(score>=60&&score<70){printf("%d--D\n",score);}else if(score>=0&&score<60){printf("%d- -E\n",score);}}#include<>main(){int year,month;printf("Input year,month:");scanf("%d,%d",&year,&month);if(month>12||month<=0){printf("error month\n");}else{switch(year,month){case 12:case 10:case 8:case 7:case 5:case 3:case 1:printf("31天\n");break;case 11:case 9:case 6:case 4:printf("30天\n");break;case 2:if(year%4==0&&year!=0||year%400==0){printf("29天\n");}else{printf("28天\n");}break;default:printf("Input error\n");}}}(1) #include<>main(){int i,j,k;char space=' ';for(i=1;i<=4;i++){for(j=1;j<=i;j++){printf("%c",space);}for(k=1;k<=6;k++){printf("*");}printf("\n");}}(2) #include<>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0) continue;k--;}printf("k=%d\n,n=%d\n",k,n);}(3) #include<>main(){int k=4,n;for(n=0;n<k;n++){if(n%2==0) break;k--;}printf("k=%d,n=%d\n",k,n);}(1) #include<>main(){int i,sum=0;for(i=1;i<=101;i++){sum=sum+i;}printf("sum=%d\n",sum);}(2) #include<>main(){long i;long term,sum=0;for(i=1;i<=101;i=i+2){term=i*(i+1)*(i+2);sum=sum+term;}printf("sum=%ld\n",sum);}(4) #include<>#include<>main(){int n=1;float term=,sign=1,sum=0;while(term<=-1e-4||term>=1e-4){term=sign;sum=sum+term;sign=sign+n;n++;}printf("sum=%f\n",sum);}(5) #include<>#include<>main(){int n=1,count=1;float x;double sum,term;printf("Input x:");scanf("%f",&x);sum=x;term=x;do{term=-term*x*x/((n+1)*(n+2));sum=sum+term;n=n+2;count++;}while(fabs(term)>=1e-5);printf("sin(x)=%f,count=%d\n",sum,count);}#include<>main(){int x=1,find=0;while(!find){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;x++;}}}/* int x,find=0;for (x=1;!find;x++){if(x%2==1&&x%3==2&&x%5==4&&x%6==5&&x%7==0){printf("x=%d\n",x);find=1;}}}*/#include<>main(){int i,n;long p=1,m=1;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){p=i*i;m=i*i*i;printf("p=%d,m=%d\n",i,p,i,m);}}#include<>main(){float c,f;for(c=-40;c<=110;c=c+10){f=9/5*c+32;printf("f=%f\n",f);}}#include<>#include<>main(){int n;double c=,x;do{x=x*pow(1+c,12)-1000;n++;}while(x>0);printf("x=%d\n",x);}#include<>main(){int n=0;float a=,c;printf("Inputc:");scanf("%f",&c);do{a=a*(1+c);n++;}while(a<=200);printf("n=%d\n",n);}#include<>#include<>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=pow(-1,count)*(n+2));sum=sum+term;n=n+2;count++;}sum=4*sum;printf( "sum=%f,count=%d\n",sum,count); }#include<>#include<>main(){int n=1,count=1;double sum=1,term=1;while(fabs(term)>=1e-5){term=term*n);sum=sum+term;n++;count++;}printf("sum=%f,count=%d\n",sum,count);}#include<>#include<>main(){int x;for(x=100;x<=999;x++){if(x==pow(x/100,3)+pow(x/10%10,3)+pow(x%10,3))printf("x=%d\n",x);}}#include<>main(){int i=0,n;long sum=0,term=1;printf("Inputn:");scanf("%d",&n);do{i++;term=term*i;sum=sum+term;}while(sum<n);printf("%d\n",i-1);}#include<>main(){int i,n,m,count=0,sum=0;printf("Input n:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}#include<>main(){int i,n,m,count=0,sum=0;printf("Inputn:");scanf("%d",&n);for(i=1;i<=n;i++){printf("Inputm:");scanf("%d",&m);if(m>0||m<0){sum=sum+m;count++;}else{break;}printf("sum=%d,count=%d\n",sum,count);}}#include<>main(){int x,y,z;for(x=0;x<=17;x++){for(y=0;y<=25;y++){3*x+2*y+z==50;z=30-x-y;if( 3*x+2*y+z==50&&x+y+z==30)printf("x=%d,y=%d,z=%d\n",x,y,z);}}}#include<>main(){int x,y;for(x=0;x<=98;x++){y=98-x;2*x+4*y==386;if(x+y==98&&2*x+4*y==386){printf("x=%d,y=%d\n",x,y);}}}#include<>main(){int x,y,z;for(x=0;x<=20;x++){for(y=0;y<=33;y++){3*y+5*x+z/==100;z=100-x-y;if (5*x+3*y+z/==100&&z+x+y==100){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}#include<>main(){int x,y,z;for(x=1;x<=9;x++){for(y=1;y<=17;y++){10*x+5*y+z==100;z=50-x-y;if( 10*x+5*y+z==100&&x+y+z==50&&z>0){printf("x=%d,y=%d,z=%d\n",x,y,z);}}}}#include<>int Square(int i){return i*i;}int main(){int i=0;i=Square(i);for( ;i<3;i++){static int i=1;i+=Square(i);printf("%d,",i);}printf("%d\n",i);return 0;}#include<>int hour,minute,second;void update(){second++;if(second==60){second=0;minute++;}if(minute==60){minute=0;hour++;}if(hour==24)hour=0;}void display(){printf("%d,%d,%d\n",hour,minute,second);}void delay(){int t;for(t=0;t<0;t++);}int main(){int i;void updaye(),display(),delay();for(i=0;i<1000000;i++){update();display();delay();}return 0;}#include<>int GetMax(int a,int b);int main(){int x,y,max;printf("Inputx,y:");scanf("%d,%d",&x,&y);max=GetMax(x,y);printf("max=%d\n",max);return 0;}int GetMax(int m,int n){if(m>=n)return m;elsereturn n;}#include<>int LCM(int n,int m);int main(){int a,b;printf("Inputa,b:");scanf("%d,%d",&a,&b);printf("%d\n",LCM(a,b));return 0;}int LCM(int n,int m){int x;int find=0;for(x=1;!find;x++){if(x%n==0&&x%m==0){find=1;}}return x-1;}#include<>long Fact(int n);int main(){int m,a;printf("Inputm:");scanf("%d",&m);for(a=1;a<=m;a++){printf("%d!=%ld\n",a,Fact(a));}return 0;}long Fact(int n){int i;long result=1;for(i=2;i<=n;i++)result*=i;return result;}#include<>long Fact(int n);int main(){int m;long ret;printf("Inputm:");scanf("%d",&m);ret=Fact(m);printf("ret=%d\n",ret);return 0;}long Fact(int n){int i;long result=1,sum=0;for(i=2;i<=n;i++){result*=i;sum=sum+result;}return sum;}(1) #include<>int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return 0;}int Gcd(int a,int b){int t,min,find=0;min=a<ba:b;t=min;for(t=min;!find;t--){a%t==0;b%t==0;if(a%t==0&&b%t==0)return t;}find=1;}(2) #include<>int Gcd(int a,int b);int main(){int m,n;printf("Inputm,n:");scanf("%d,%d",&m,&n);printf("%d\n",Gcd(m,n));return 0;}int Gcd(int a,int b){int r,temp;r=a%b;if(r==0)return b;elsedo{temp=b;b=r;a=temp;r=a%b;}while(r!=0);return b;}(1) #include<>void Func(int x){x=2;}int main(){int x=10;Func(x);printf("%d",x);return 0;}(2) #include<>void Func(int b[]){int j;for(j=0;j<4;j++){b[j]=j;}}int main(){static int a[]={5,6,7,8},i;Func(a);for(i=0;i<4;i++){printf("%d",a[i]);}return 0;}(1) int PositiveNum(int a[],int n){int i,count=0;for(i=0;i<n;i++){if(a[i]>0)count++;}return 0;}(2) void Fib(long f[],long n){int i;f[0]=0;f[1]=1;for(i=2;i<n;i++){f[i]=f[i-1]+f[i-2];}}(3) #include<>int main(){int a[10],n,max,min,maxPos,minPos;for(n=0;n<10;n++){scanf("%d",&a[n]);}max=min=a[0];maxPos=minPos=0;for(n=0;n<10;n++){if(a[n]>max){max=a[n];maxPos=n;}else if(a[n]<min){min=a[n];minPos=n;}}printf("max=%d,pos=%d\n",max,maxPos);printf("min=%d,pos=%d\n",min,minPos);return 0;}void DivArray(int *pArray,int n){int i;for(i=0;i<n;i++){pArray[i]/=pAttay[0];}}#include<>#define N 40int FailNum(int score[],int n);void ReadScore(int score[],int n);int main(){int score[N],n;printf("Input n:");scanf("%d",&n);ReadScore(score,n);FailNum(score,n);printf("FailNum students are %d\n",FailNum(score,n));return 0;}int FailNum(int score[],int n){int i,count=0;for(i=0;i<n;i++){if(score[i]<60)count++;}return count;}void ReadScore(int score[],int n){int i;printf("Input score:");for(i=0;i<n;i++){scanf("%d",&score[i]);}}#include<>#define N 40int HighAver(int score[],int n);int ReadScore(int score[]);int main(){int score[N],n;n=ReadScore(score);printf("HighAver students are %d\n",HighAver(score,n));return 0;}int HighAver(int score[],int n){int i,count=0,sum=0,aver;for(i=0;i<n;i++){sum=sum+score[i];aver=sum/n;}for(i=0;i<n;i++){if(score[i]>aver)count++;}return count;}int ReadScore(int score[]){int i=-1;do{i++;printf("Input score:");scanf("%d",&score[i]);}while(score[i]>=0);return i;}#include<>#define N 40int ReadScore(int score[],long num[]);int FindMax(int score[],long num[],int n);int main(){int score[N],n,max,num,t;long num[N];t=FindMax(score,n);max=score[t];num=num[t];printf("max=%d,num=%d\n",max,num);return 0;}int ReadScore(int score[],long num[]){int i=-1;do{i++;printf("Input student's ID and score:");scanf("%ld%d",&num[i],&score[i]);}while(num[i]>0&&score[i]>=0);return i;}int FindMax(int score[],long num[],int n){int max,i;max=score[0];for(i=1;i<n;i++){if(score[i]>max)max=score[i];}return i;}#include<>#define N 40int Read(int a[]);int ChangeArry(int a[],int n);int main(){int a[N],n;printf("%d\n",ChangeArry(a,n));return 0;}int Read(int a[]){int i;for(i=0;i<9;i++){printf("Input a:");scanf("%d",&a[i]);return i;}int ChangeArry(int a[],int n){int max,min,i,maxpos,minpos,term;max=min=score[0];for(i=1;i<n;i++){if(a[i]>max)max=score[i];maxpos=n;else(a[i]<min)min=a[i];minpos=n;temp=maxpos;maxpos=minpos;minpos=temp;}return a[i];}#include<>#define N 5void main(){int a[N][N];int sum = 0;int i, j;printf("请输入一个%d*%d的矩阵\n",N,N);for(i = 0; i < N; i++){for(j = 0; j < N; j++){scanf("%d",&a[i][j]);}}for(i = 0; i < N; i++){for(j = 0; j < N; j++){if(i == j || i + j == N - 1)sum=sum+a[i][j];}}printf("对角线元素之和为：%d\n",sum);}#include<>#define N 2#define M 3void main(){int a[N][M],b[N][M];int i,j,sum1=0,sum2=0,sum=0;printf("请输入一个%d*%d的矩阵\n",N,M);for(i = 0; i<N; i++){for(j = 0; j< M; j++){scanf("%d",&a[i][j]);sum1=sum1+a[i][j];}}printf("请输入一个%d*%d的矩阵\n",N,M);for(i = 0; i <N; i++){for(j = 0; j <M; j++){scanf("%d",&b[i][j]);sum2=sum2+a[i][j];}}sum=sum1+sum2;printf("sum=%d\n",sum);}#include<>#define N 7void YangHui(int a[N][N],int n);void main(){int i,j,n,b[N][N];printf("Input n:");scanf("%d",&n);YangHui(b,n);for(i=0;i<n;i++){for(j=0;j<=i;j++){printf("%4d",b[i][j]);}printf("\n");}}void YangHui(int a[N][N],int n){int i,j;for(i=0;i<n;i++){a[i][0]=1;a[i][i]=1;}for(i=2;i<n;i++){for(j=1;j<i;j++)a[i][j]=a[i-1][j-1]+a[i-1][j];}}#include<>#define N 12void main(){int i;int f[N]={1,1};printf("%d:%d\n",0,f[0]);printf("%d:%d\n",1,f[1]);for(i=2;i<N;i++){f[i]=f[i-1]+f[i-2];printf("%d:%d\n",i+1,f[i]);}}#include<>#include<>#include<>#define N 6000void main(){int a[N],i;int b1=0,b2=0,b3=0,b4=0,b5=0,b6=0;float p1,p2,p3,p4,p5,p6;srand(time(NULL));for(i=0;i<N;i++){a[i]=rand()%6+1;printf("%3d",a[i]);if(a[i]==1)b1++;if(a[i]==2)b2++;if(a[i]==3)b3++;if(a[i]==4)b4++;if(a[i]==5)b5++;if(a[i]==6)b6++;p1=(float)(b1/;p2=(float)(b2/;p3=(float)(b3/;p4=(float)(b4/;p5=(float)(b5/;p6=(float)(b6/;}printf("骰子出现1的概率：%.2f\n",p1);printf("骰子出现2的概率：%.2f\n",p2);printf("骰子出现3的概率：%.2f\n",p3);printf("骰子出现4的概率：%.2f\n",p4);printf("骰子出现5的概率：%.2f\n",p5);printf("骰子出现6的概率：%.2f\n",p6);}(1) void Swap(int *x,int *y){int *pTemp;.\n");else if(strcmp(userInput,password)<0)printf("Invalid password!user input<password...\n");elseprintf("Invalid password!user input>password...\n");return 0;}#include<>#define N 24unsigned int CountLetter(char str[]);{char a[N];printf("Input a letter:\n");gets(a);printf("The length of the letter is:%d\n",CountLetter(a));return 0;}unsigned int CountLetter(char str[]){char *p=str;int c=0,flag=0;while(*p!='\0'){if(*p!=' ')flag=1;else if(flag==1){c++;flag=0;}p++;}return c+1;}#include<>typedef struct data{int year;int month;int day;}DATA;typedef struct work{char a[14];char b[10];char c[6];}WORK;typedef struct student{char studentName[10];char studentSex;DATA birthday;WORK profession;int main(){STUDENT stu={"王刚",'M',{1991,5,19},{"信息工程系","学习人员","学生"}};printf("stu:%2s%3c%6d/%02d/%02d%4s,%4s,%4s\n",,, return 0; }#include<>#include<>#define N 10typedef struct people{char peopleName[10];}PEOPLE;int main(){int sum1=0,sum2=0,sum3=0,sum4=0;int i;char name[N][N];PEOPLE stu[5]={"zhang","li","wang"};printf("Enter their name:\n");for(i=0;i<10;i++){gets(name[i]);if(strcmp(name[i],stu[0].peopleName)==0)sum1++;else if(strcmp(name[i],stu[1].peopleName)==0)sum2++;else if(strcmp(name[i],stu[2].peopleName)==0)sum3++;elsesum4++;}printf("stu:%4s%2d\n",stu[i].peopleName,sum[j]);printf("stu:%4s%2d\n",stu[1].peopleName,sum2);printf("stu:%4s%2d\n",stu[2].peopleName,sum3);printf("%2d\n",sum4);return 0;}。

2.2#iiiclude<stdio.h>main(){float x=2・5,y=2・5,z=2・5;pnntf(M x=%far\x); pnntf(M y=%fur\y);pmitf(”z=%f\n”,z);}3.1(1) #iiiclude<stdio.h> main(){int a=12,b=3;float x=18・5,y=4・6;printf(,,%d,di,\(float)(a*b)/2); pmitf(・％d\n役(int)x%(mt)y);}3.2#iiiclude<stdio.h>main(){int x,b0,bl,b2,s; pnntf(M Iiiputx:H);scanfC%dt&x);b2=x/100; bl=(x-b2*100)/10;b0=x%10; s=b0*100+bl*10+b2;}3.3# iiiclude<stdio.h>#mclude<math.h>main(){float rate=0.0225;float n,capital,deposit;printf(M Iiiput n,capital:H);scanf("%f,%f；&n,&capital);deposit=capital*pow(l+iate,n);printf(M deposit=%fji'\deposit);}3.4#iiiclude<stdio.h>#mclude<math.h>main()float 久b,c;double x,y;printf(M Iiiputa,b,c:H);scanf(H%f,%f,%f\&a.&b、&c);x=(-b+sqit(b*b-4*a*c))/(2 *a);y=(-b-sqrt(b*b-4*a*c))/(2*a); pnntfC，x=%fy=%fur\x,y);}4.1(1) #iiiclude<stdio.h>main(){char cl=,a\c2=,b\c3=t c,;printf(,l a%cb%cc%c\n,\c 1 ,c2,c3);}4.1(2) #iiiclude<stdio.h>main(){int a=12,b=15;pmHfTa=%d%%,b=%d%%S”,a,b);}4.1(3) #iiiclude<stdio.h>main(){int a、b;scanfC%2d%*2s%2d”,&a,&b);piiDtfp%d.%d\ir；a,b);}4.2#iiiclude<stdio.h>main(){long a,b;float x、y;scanfC%d,%d\n 役&a.&b);scanf(H%f,%fur\&x.&y);piintf(M a=%d.b=%d,,ii,\a.b); pnntfC，x=%fb=%far\x,v);}5.1 #iiiclude<stdio.h>main(){float a;scanf(H%f\&a);if(a>=0)a=a; pnntf「a=%f\n=);}else{a=-a; pnntf「a=%f\n=);}}5 ・ 2 #iiiclude<stdio.h>main(){int a;pnntf(H Iiiputa:H);scanff%cT；&a);if(a%2==0){prmtf("a 是偶数”)；}else{piuitf("a 是奇数”)；}}5.3#iiiclude<stdio.h>#mclude<math.h>main(){float a,b,c,s,area; pnntH M Iiiputa,b,c:H);scanf(H%f,%f,%f\&a,&b,&c);if(a+b>c&&a+c>b&&b+c>a) {s=(a+b+c)/2;area=(float)sqrt(s * (s-a) * (s-b)* (s-c));priiitf(n aiea=%f.n,\area);}else{pnntf(”不是三角形”)；}}5.4#iiiclude<stdio.h>#iiiclude<math.li>mam()float a、b,c，x,y;pmitfClnputabcJ);if(a=0){ pnntf(”该方程不是一元二次方程®”)；}if(b*b-4*a*c>0){ x=(-b+sqrt(b *b-4*a *c))/(2*a);v=(-b-sqrt(b*b-4*a*c))/(2*a); pnntf「x=%f,y=%fm役x，y);}else if(b*b-4*a*c=0){x=-b/(2*a);v=-b/(2*a); pnntf「x=%f,y=%fm 役x，y);}else{ pnntf(”该方程无实根\n”)；}}5.5#iiiclude<stdio.h>main(){int yeai;flag;printf(M Iiiput a vear:H);scanf^^d^&yeai);if(y 亡ai%4==0&&yeai-%400! =01 |year%400==0) { flag=l;}else{flag=0;}if(flag==l)piiiitf(n%d is a leap year !\n”,yeaQ;elsepiiiitf(,,%d is not a leap year l^^year);}}5.6#iiiclude<stdio.h>main(){int yeai;flag;printf(M Iiiput a vear:H);scanfl^d^&yeai);flag=veai-%400=0||year%4==0&&y 亡ai%100!=0H:0;if(flag==l && flag! =0){priiitf(n%d is a leap year !\n,\vear);}else{is not a leap year l^^year);}}5.7#iiiclude<stdio.h>main(){char ch;pnntf(M Iiiputch:H);scanf(”％c-&ch);if(ch>=,a,&&ch<=N){ch=getchai();ch=ch・32;printf(n%c,%d\n,\ch,ch);}else if(ch>=,A,&&cli<='Z f){ch=getchai();ch=ch+32;printf(n%c,%d\n,\ch,ch);}elsepnntff%L，ch);5 ・ 8 #iiiclude<stdio.h> main()char ch; pnntf(M Iiiputch:H); scanf(”％ct&ch);if(ch>=48&&ch<=57){pruitf("ch是数字字符\n");}else if(ch>=65&&ch<=90){pimtfC'ch是大写字母\n");}else if(ch>=97&&ch<=122){ pnntf(”ch是小写字母\n");}else if(ch==32){printf(” ch 是空格\n”);}else{ pimtfC'ch是其他字符\n”);}}5.9 #iiiclude<stdio.h>main(){int score,grade; printf(M Iiiput score:n); scanf(H%d,\&scoie);grade=score/10; if(score<0|| score> 100){priiitf(n Input enor\n H);}if(score>=90&&score<= 100){prmtf(H%d-A\ii,\score);}else if(score>=80&&score<90)(n \H<ormuud&use。