谭浩强c++程序设计课后答案娄警卫第一章1.5题#include <iostream> using namespace std; int main(){cout<<"This"<<"is"; cout<<"a"<<"C++"; cout<<"program."; return 0;1.6题#include <iostream> using namespace std; int main(){int a,b,c;a=10;b=23;c=a+b;cout<<"a+b="; cout<<c;cout<<endl;return 0;}1.7七题#include <iostream> using namespace std; int main(){int a,b,c;int f(int x,int y,int z); cin>>a>>b>>c;c=f(a,b,c);cout<<c<<endl; return 0;}int f(int x,int y,int z) {int m;if (x<y) m=x;else m=y;if (z<m) m=z;return(m);}1.8题#include <iostream>using namespace std;int main(){int a,b,c;cin>>a>>b;c=a+b;cout<<"a+b="<<a+b<<endl; return 0;}1.9题#include <iostream>using namespace std;int main(){int a,b,c;int add(int x,int y); cin>>a>>b;c=add(a,b);cout<<"a+b="<<c<<endl; return 0;}int add(int x,int y){int z;z=x+y;return(z);}第二章2.3题#include <iostream>using namespace std;int main(){char c1='a',c2='b',c3='c',c4='\101',c5='\116'; cout<<c1<<c2<<c3<<'\n';cout<<"\t\b"<<c4<<'\t'<<c5<<'\n';return 0;}2.4题#include <iostream>using namespace std;int main(){char c1='C',c2='+',c3='+';cout<<"I say: \""<<c1<<c2<<c3<<'\"';cout<<"\t\t"<<"He says: \"C++ is very interesting!\""<< '\n';return 0;}2.7题#include <iostream>using namespace std;int main(){int i,j,m,n;i=8;j=10;m=++i+j++;n=(++i)+(++j)+m;cout<<i<<'\t'<<j<<'\t'<<m<<'\t'<<n<<endl; return 0;}2.8题#include <iostream>using namespace std;int main(){char c1='C', c2='h', c3='i', c4='n', c5='a';c1+=4;c2+=4;c3+=4;c4+=4;c5+=4;cout<<"password is:"<<c1<<c2<<c3<<c4<<c5<<endl;return 0;}第三章3.2题#include <iostream>#include <iomanip>using namespace std;int main ( ){float h,r,l,s,sq,vq,vz;const float pi=3.1415926;cout<<"please enter r,h:";cin>>r>>h;l=2*pi*r;s=r*r*pi;sq=4*pi*r*r;vq=3.0/4.0*pi*r*r*r;vz=pi*r*r*h;cout<<setiosflags(ios::fixed)<<setiosflags(ios:: right)<<setprecision(2);cout<<"l= "<<setw(10)<<l<<endl;cout<<"s= "<<setw(10)<<s<<endl;cout<<"sq="<<setw(10)<<sq<<endl;cout<<"vq="<<setw(10)<<vq<<endl;cout<<"vz="<<setw(10)<<vz<<endl;return 0;}3.3题#include <iostream>using namespace std;int main (){float c,f;cout<<"请输入一个华氏温度:";cin>>f;c=(5.0/9.0)*(f-32); //注意5和9要用实型表示,否则5/9值为0cout<<"摄氏温度为:"<<c<<endl;return 0;};3.4题#include <iostream>using namespace std;int main ( ){char c1,c2;cout<<"请输入两个字符c1,c2:";c1=getchar(); //将输入的第一个字符赋给c1c2=getchar(); //将输入的第二个字符赋给c2cout<<"用putchar函数输出结果为:"; putchar(c1);putchar(c2);cout<<endl;cout<<"用cout语句输出结果为:";cout<<c1<<c2<<endl;return 0;}3.4题另一解#include <iostream>using namespace std;int main ( ){char c1,c2;cout<<"请输入两个字符c1,c2:";c1=getchar(); //将输入的第一个字符赋给c1c2=getchar(); //将输入的第二个字符赋给c2cout<<"用putchar函数输出结果为:"; putchar(c1);putchar(44);putchar(c2);cout<<endl;cout<<"用cout语句输出结果为:";cout<<c1<<","<<c2<<endl;return 0;}3.5题#include <iostream>using namespace std;int main ( ){char c1,c2;int i1,i2; //定义为整型cout<<"请输入两个整数i1,i2:";cin>>i1>>i2;c1=i1;c2=i2;cout<<"按字符输出结果为:"<<c1<<" , "<<c2<<endl;return 0;}3.8题#include <iostream>using namespace std;int main ( ){ int a=3,b=4,c=5,x,y;cout<<(a+b>c && b==c)<<endl;cout<<(a||b+c && b-c)<<endl;cout<<(!(a>b) && !c||1)<<endl;cout<<(!(x=a) && (y=b) && 0)<<endl;cout<<(!(a+b)+c-1 && b+c/2)<<endl; return 0;}3.9题include <iostream>using namespace std;int main ( ){int a,b,c;cout<<"please enter three integer numbers:";cin>>a>>b>>c;if(a<b)if(b<c)cout<<"max="<<c;elsecout<<"max="<<b;else if (a<c)cout<<"max="<<c;elsecout<<"max="<<a;cout<<endl;return 0;}3.9题另一解#include <iostream>using namespace std;int main ( ){int a,b,c,temp,max ;cout<<"please enter three integer numbers:";cin>>a>>b>>c;temp=(a>b)?a:b; /* 将a和b中的大者存入temp中*/max=(temp>c)?temp:c; /* 将a和b中的大者与c比较，最大者存入max*/cout<<"max="<<max<<endl;return 0;}3.10题#include <iostream>using namespace std;int main ( ){int x,y;cout<<"enter x:";cin>>x;if (x<1){y=x;cout<<"x="<<x<<", y=x="<<y;}else if (x<10) // 1≤x＜10{y=2*x-1;cout<<"x="<<x<<", y=2*x-1="<<y;}else// x≥10{y=3*x-11;cout<<"x="<<x<<",y=3*x-11="<<y;}cout<<endl;return 0;}3.11题#include <iostream>using namespace std; int main (){float score;char grade;cout<<"please enter score of student:"; cin>>score;while (score>100||score<0){cout<<"data error,enter data again.";cin>>score;}switch(int(score/10)){case 10:case 9: grade='A';break;case 8: grade='B';break;case 7: grade='C';break;case 6: grade='D';break;default:grade='E';}cout<<"score is "<<score<<", grade is "<<grade<<endl;return 0;}3.12题#include <iostream>using namespace std;int main (){long int num;intindiv,ten,hundred,thousand,ten_thousand,pla ce;/*分别代表个位,十位,百位,千位,万位和位数*/cout<<"enter an integer(0~99999):"; cin>>num;if (num>9999)place=5;else if (num>999)place=4;else if (num>99)place=3;else if (num>9)place=2;else place=1;cout<<"place="<<place<<endl;//计算各位数字ten_thousand=num/10000;thousand=(int)(num-ten_thousand*10000)/1 000;hundred=(int)(num-ten_thousand*10000-tho usand*1000)/100;ten=(int)(num-ten_thousand*10000-thousan d*1000-hundred*100)/10;indiv=(int)(num-ten_thousand*10000-thousa nd*1000-hundred*100-ten*10);cout<<"original order:";switch(place){case5:cout<<ten_thousand<<","<<thousand<<","< <hundred<<","<<ten<<","<<indiv<<endl;cout<<"reverse order:";cout<<indiv<<ten<<hundred<<thousand<<ten _thousand<<endl;break;case4:cout<<thousand<<","<<hundred<<","<<ten <<","<<indiv<<endl;cout<<"reverse order:";cout<<indiv<<ten<<hundred<<thousand<<en dl;break;case3:cout<<hundred<<","<<ten<<","<<indiv<<en dl;cout<<"reverse order:";cout<<indiv<<ten<<hundred<<endl;break;case 2:cout<<ten<<","<<indiv<<endl;cout<<"reverse order:";cout<<indiv<<ten<<endl;break;case 1:cout<<indiv<<endl;cout<<"reverse order:";cout<<indiv<<endl;break;}return 0;}3.13题#include <iostream>using namespace std;int main (){ long i; //i为利润floatbonus,bon1,bon2,bon4,bon6,bon10;bon1=100000*0.1; //利润为10万元时的奖金bon2=bon1+100000*0.075; //利润为20万元时的奖金bon4=bon2+100000*0.05; //利润为40万元时的奖金bon6=bon4+100000*0.03; //利润为60万元时的奖金bon10=bon6+400000*0.015; //利润为100万元时的奖金cout<<"enter i:";cin>>i;if (i<=100000)bonus=i*0.1;//利润在10万元以内按10%提成奖金else if (i<=200000)bonus=bon1+(i-100000)*0.075; //利润在10万元至20万时的奖金else if (i<=400000)bonus=bon2+(i-200000)*0.05; //利润在20万元至40万时的奖金else if (i<=600000)bonus=bon4+(i-400000)*0.03; //利润在40万元至60万时的奖金else if (i<=1000000)bonus=bon6+(i-600000)*0.015; //利润在60万元至100万时的奖金elsebonus=bon10+(i-1000000)*0.01; //利润在100万元以上时的奖金cout<<"bonus="<<bonus<<endl;return 0;}3.13题另一解#include <iostream>using namespace std;int main (){long i;float bonus,bon1,bon2,bon4,bon6,bon10; int c;bon1=100000*0.1;bon2=bon1+100000*0.075;bon4=bon2+200000*0.05;bon6=bon4+200000*0.03;bon10=bon6+400000*0.015;cout<<"enter i:";cin>>i;c=i/100000;if (c>10) c=10;switch(c){case 0: bonus=i*0.1; break;case 1: bonus=bon1+(i-100000)*0.075; break;case 2:case3:bonus=bon2+(i-200000)*0.05;break;case 4:case5:bonus=bon4+(i-400000)*0.03;break;case 6:case 7:case 8:case 9: bonus=bon6+(i-600000)*0.015; break;case 10: bonus=bon10+(i-1000000)*0.01;}cout<<"bonus="<<bonus<<endl;return 0;}3.14题#include <iostream>using namespace std;int main (){int t,a,b,c,d;cout<<"enter four numbers:";cin>>a>>b>>c>>d;cout<<"a="<<a<<", b="<<b<<", c="<<c<<",d="<<d<<endl;if (a>b){t=a;a=b;b=t;}if (a>c){t=a; a=c; c=t;}if (a>d){t=a; a=d; d=t;}if (b>c){t=b; b=c; c=t;}if (b>d){t=b; b=d; d=t;}if (c>d){t=c; c=d; d=t;}cout<<"the sorted sequence:"<<endl;cout<<a<<", "<<b<<", "<<c<<", "<<d<<endl; return 0;}3.15题#include <iostream>using namespace std;int main (){int p,r,n,m,temp;cout<<"please enter two positive integer numbers n,m:";cin>>n>>m;if (n<m){temp=n;n=m;m=temp; //把大数放在n中, 小数放在m中}p=n*m; //先将n和m的乘积保存在p中, 以便求最小公倍数时用while (m!=0) //求n和m的最大公约数{r=n%m;n=m;m=r;}cout<<"HCF="<<n<<endl;cout<<"LCD="<<p/n<<endl; // p是原来两个整数的乘积return 0;}3.16题#include <iostream>using namespace std;int main (){char c;int letters=0,space=0,digit=0,other=0;cout<<"enter one line::"<<endl;while((c=getchar())!='\n'){if (c>='a' && c<='z'||c>='A' && c<='Z')letters++;else if (c==' ')space++;else if (c>='0' && c<='9')digit++;elseother++;}cout<<"letter:"<<letters<<", space:"<<space<<", digit:"<<digit<<", other:"<<other<<endl;return 0;}3.17题#include <iostream>using namespace std;int main (){int a,n,i=1,sn=0,tn=0;cout<<"a,n=:";cin>>a>>n;while (i<=n){tn=tn+a; //赋值后的tn为i个a 组成数的值sn=sn+tn; //赋值后的sn为多项式前i项之和a=a*10;++i;}cout<<"a+aa+aaa+...="<<sn<<endl;return 0;}3.18题#include <iostream>using namespace std;int main (){float s=0,t=1;int n;for (n=1;n<=20;n++){t=t*n; // 求n!s=s+t; // 将各项累加}cout<<"1!+2!+...+20!="<<s<<endl;return 0;}3.19题#include <iostream>using namespace std;int main (){int i,j,k,n;cout<<"narcissus numbers are:"<<endl;for (n=100;n<1000;n++){i=n/100;j=n/10-i*10;k=n%10;if (n == i*i*i + j*j*j + k*k*k)cout<<n<<" ";}cout<<endl;return 0;}3.20题#include <iostream>using namespace std;int main(){const int m=1000; // 定义寻找范围int k1,k2,k3,k4,k5,k6,k7,k8,k9,k10;int i,a,n,s;for (a=2;a<=m;a++) // a是2~1000之间的整数，检查它是否为完数{n=0; // n用来累计a的因子的个数s=a; // s用来存放尚未求出的因子之和，开始时等于afor (i=1;i<a;i++) // 检查i是否为a 的因子if (a%i==0) // 如果i是a的因子{n++; // n加1，表示新找到一个因子s=s-i; // s减去已找到的因子，s的新值是尚未求出的因子之和switch(n) // 将找到的因子赋给k1,...,k10{case 1:k1=i; break; // 找出的笫1个因子赋给k1case 2:k2=i; break; // 找出的笫2个因子赋给k2case 3:k3=i; break; // 找出的笫3个因子赋给k3case 4:k4=i; break; // 找出的笫4个因子赋给k4case 5:k5=i; break; // 找出的笫5个因子赋给k5case 6:k6=i; break; // 找出的笫6个因子赋给k6case 7:k7=i; break; // 找出的笫7个因子赋给k7case 8:k8=i; break; // 找出的笫8个因子赋给k8case 9:k9=i; break; // 找出的笫9个因子赋给k9case 10:k10=i; break; // 找出的笫10个因子赋给k10}}if (s==0) // s=0表示全部因子都已找到了{cout<<a<<" is a 完数"<<endl;cout<<"its factors are:";if (n>1) cout<<k1<<","<<k2; // n>1表示a至少有2个因子if (n>2) cout<<","<<k3; // n>2表示至少有3个因子，故应再输出一个因子if (n>3) cout<<","<<k4; // n>3表示至少有4个因子，故应再输出一个因子if (n>4) cout<<","<<k5; // 以下类似if (n>5) cout<<","<<k6;if (n>6) cout<<","<<k7;if (n>7) cout<<","<<k8;if (n>8) cout<<","<<k9;if (n>9) cout<<","<<k10;cout<<endl<<endl;}}return 0;}3.20题另一解#include <iostream>using namespace std;int main(){int m,s,i;for (m=2;m<1000;m++){s=0;for (i=1;i<m;i++)if ((m%i)==0) s=s+i;if(s==m){cout<<m<<" is a完数"<<endl;cout<<"its factors are:";for (i=1;i<m;i++)if (m%i==0) cout<<i<<" ";cout<<endl;}}return 0;}3.20题另一解#include <iostream>using namespace std;int main(){int k[11];int i,a,n,s;for (a=2;a<=1000;a++){n=0;s=a;for (i=1;i<a;i++)if ((a%i)==0){n++;s=s-i;k[n]=i; // 将找到的因子赋给k[1]┅k[10]}if (s==0){cout<<a<<" is a 完数"<<endl;cout<<"its factors are:";for (i=1;i<n;i++)cout<<k[i]<<" ";cout<<k[n]<<endl;}}return 0;}3.21题#include <iostream>using namespace std;int main(){int i,t,n=20;double a=2,b=1,s=0;for (i=1;i<=n;i++){s=s+a/b;t=a;a=a+b; // 将前一项分子与分母之和作为下一项的分子b=t; // 将前一项的分子作为下一项的分母}cout<<"sum="<<s<<endl;return 0;} 3.22题#include <iostream>using namespace std;int main(){int day,x1,x2;day=9;x2=1;while(day>0){x1=(x2+1)*2; // 第1天的桃子数是第2天桃子数加1后的2倍x2=x1;day--;}cout<<"total="<<x1<<endl;return 0;}3.23题#include <iostream>#include <cmath>using namespace std;int main(){float a,x0,x1;cout<<"enter a positive number:"; cin>>a; // 输入a的值x0=a/2;x1=(x0+a/x0)/2;do{x0=x1;x1=(x0+a/x0)/2;}while(fabs(x0-x1)>=1e-5);cout<<"The square root of "<<a<<" is "<<x1<<endl;return 0;}3.24题#include <iostream>using namespace std;int main(){int i,k;for (i=0;i<=3;i++) // 输出上面4行*号{for (k=0;k<=2*i;k++)cout<<"*"; // 输出*号cout<<endl; //输出完一行*号后换行}for (i=0;i<=2;i++) // 输出下面3行*号{for (k=0;k<=4-2*i;k++)cout<<"*"; // 输出*号cout<<endl; // 输出完一行*号后换行}return 0;}3.25题#include <iostream>using namespace std;int main(){char i,j,k; /* i是a的对手;j是b的对手;k是c的对手*/for (i='X';i<='Z';i++)for (j='X';j<='Z';j++)if (i!=j)for (k='X';k<='Z';k++)if (i!=k && j!=k)if (i!='X' && k!='X' && k!='Z')cout<<"A--"<<i<<"B--"<<j<<" C--"<<k<<endl;return 0;}第四章4.1题#include <iostream>using namespace std;int main(){int hcf(int,int);int lcd(int,int,int);int u,v,h,l;cin>>u>>v;h=hcf(u,v);cout<<"H.C.F="<<h<<endl;l=lcd(u,v,h);cout<<"L.C.D="<<l<<endl;return 0;}int hcf(int u,int v){int t,r;if (v>u){t=u;u=v;v=t;}while ((r=u%v)!=0){u=v;v=r;}return(v);}int lcd(int u,int v,int h){return(u*v/h);}4.2题#include <iostream>#include <math.h>using namespace std;float x1,x2,disc,p,q;int main(){void greater_than_zero(float,float); void equal_to_zero(float,float);void smaller_than_zero(float,float); float a,b,c;cout<<"input a,b,c:";cin>>a>>b>>c;disc=b*b-4*a*c;cout<<"root:"<<endl;if (disc>0){greater_than_zero(a,b);cout<<"x1="<<x1<<",x2="<<x2<<endl; }else if (disc==0){equal_to_zero(a,b);cout<<"x1="<<x1<<",x2="<<x2<<endl;}else{smaller_than_zero(a,b);cout<<"x1="<<p<<"+"<<q<<"i"<<endl;cout<<"x2="<<p<<"-"<<q<<"i"<<endl;}return 0;}void greater_than_zero(float a,float b) /* 定义一个函数，用来求disc>0时方程的根*/{x1=(-b+sqrt(disc))/(2*a);x2=(-b-sqrt(disc))/(2*a);}void equal_to_zero(float a,float b) /* 定义一个函数，用来求disc=0时方程的根*/{x1=x2=(-b)/(2*a);}void smaller_than_zero(float a,float b) /* 定义一个函数，用来求disc<0时方程的根*/{p=-b/(2*a);q=sqrt(-disc)/(2*a);}4.3题#include <iostream>using namespace std;int main(){int prime(int); /* 函数原型声明*/int n;cout<<"input an integer:";cin>>n;if (prime(n))cout<<n<<" is a prime."<<endl;elsecout<<n<<" is not a prime."<<endl;return 0;}int prime(int n){int flag=1,i;for (i=2;i<n/2 && flag==1;i++)if (n%i==0)flag=0;return(flag);}4.4题#include <iostream>using namespace std;int main(){int fac(int);int a,b,c,sum=0;cout<<"enter a,b,c:";cin>>a>>b>>c;sum=sum+fac(a)+fac(b)+fac(c);cout<<a<<"!+"<<b<<"!+"<<c<<"!="<<sum<<e ndl;return 0;}int fac(int n){int f=1;for (int i=1;i<=n;i++)f=f*i;return f;}4.5题#include <iostream>#include <cmath>using namespace std;int main(){double e(double);double x,sinh;cout<<"enter x:";cin>>x;sinh=(e(x)+e(-x))/2;cout<<"sinh("<<x<<")="<<sinh<<endl;return 0;}double e(double x){return exp(x);}4.6题#include <iostream>#include <cmath>using namespace std;int main(){doublesolut(double ,double ,double ,double ); double a,b,c,d;cout<<"input a,b,c,d:";cin>>a>>b>>c>>d;cout<<"x="<<solut(a,b,c,d)<<endl;return 0;}double solut(double a,double b,double c,double d){double x=1,x0,f,f1;do{x0=x;f=((a*x0+b)*x0+c)*x0+d;f1=(3*a*x0+2*b)*x0+c;x=x0-f/f1;}while(fabs(x-x0)>=1e-5);return(x);}4.7题#include <iostream>#include <cmath>using namespace std;int main(){void godbaha(int);int n;cout<<"input n:";cin>>n;godbaha(n);return 0;}void godbaha(int n){int prime(int);int a,b;for(a=3;a<=n/2;a=a+2){if(prime(a)){b=n-a;if (prime(b))cout<<n<<"="<<a<<"+"<<b<<endl;}}}int prime(int m){int i,k=sqrt(m);for(i=2;i<=k;i++)if(m%i==0) break;if (i>k) return 1;else return 0;}4.8题#include <iostream>using namespace std;int main(){int x,n;float p(int,int);cout<<"input n & x:";cin>>n>>x;cout<<"n="<<n<<",x="<<x<<endl;;cout<<"P"<<n<<"(x)="<<p(n,x)<<endl; return 0;}float p(int n,int x){if (n==0)return(1);else if (n==1)return(x);elsereturn(((2*n-1)*x*p((n-1),x)-(n-1)*p((n-2),x))/n);}4.9题#include <iostream>using namespace std;int main(){void hanoi(int n,char one,char two,char three);int m;cout<<"input the number of diskes:"; cin>>m;cout<<"The steps of moving "<<m<<" disks:"<<endl;hanoi(m,'A','B','C');return 0;}void hanoi(int n,char one,char two,char three) //将n个盘从one座借助two座，移到three座{void move(char x,char y);if(n==1) move(one,three);else{hanoi(n-1,one,three,two);move(one,three);hanoi(n-1,two,one,three);}}void move(char x,char y){cout<<x<<"-->"<<y<<endl;}4.10题#include <iostream>using namespace std;int main(){void convert(int n);int number;cout<<"input an integer:";cin>>number;cout<<"output:"<<endl;if (number<0){cout<<"-";number=-number;}convert(number);cout<<endl;return 0;}void convert(int n){int i;char c;if ((i=n/10)!=0)convert(i);c=n%10+'0';cout<<" "<<c;}4.11题#include <iostream>using namespace std;int main(){int f(int);int n,s;cout<<"input the number n:";cin>>n;s=f(n);cout<<"The result is "<<s<<endl;return 0;}int f(int n){;if (n==1)return 1;elsereturn (n*n+f(n-1));}4.12题#include <iostream>#include <cmath>using namespace std;#define S(a,b,c) (a+b+c)/2#define AREA(a,b,c)sqrt(S(a,b,c)*(S(a,b,c)-a)*(S(a,b,c)-b)*(S(a,b,c) -c))int main(){float a,b,c;cout<<"input a,b,c:";cin>>a>>b>>c;if (a+b>c && a+c>b && b+c>a)cout<<"area="<<AREA(a,b,c)<<endl; elsecout<<"It is not a triangle!"<<endl; return 0;}4.14题#include <iostream>using namespace std;//#define LETTER 1int main(){char c;cin>>c;#if LETTERif(c>='a' && c<='z')c=c-32;#elseif(c>='A' && c<='Z')c=c+32;#endifcout<<c<<endl;return 0;}4.15题#include <iostream>using namespace std;#define CHANGE 1int main(){char ch[40];cout<<"input text:"<<endl;;gets(ch);#if (CHANGE){for (int i=0;i<40;i++){if (ch[i]!='\0')if (ch[i]>='a'&& ch[i]<'z'||ch[i]>'A'&& ch[i]<'Z')ch[i]+=1;else if (ch[i]=='z'||ch[i]=='Z')ch[i]-=25;}}#endifcout<<"output:"<<endl<<ch<<endl;return 0;}4.16题file#include <iostream>using namespace std;int a;int main(){extern int power(int);int b=3,c,d,m;cout<<"enter an integer a and its power m:"<<endl;cin>>a>>m;c=a*b;cout<<a<<"*"<<b<<"="<<c<<endl;d=power(m);cout<<a<<"**"<<m<<"="<<d<<endl; return 0;}4.16题fileextern int a;int power(int n){int i,y=1;for(i=1;i<=n;i++)y*=a;return y;}第五章5.1题#include <iostream>#include <iomanip>using namespace std;#include <math.h>int main(){int i,j,n,a[101];for (i=1;i<=100;i++)a[i]=i;a[1]=0;for (i=2;i<sqrt(100);i++)for (j=i+1;j<=100;j++){if(a[i]!=0 && a[j]!=0)if (a[j]%a[i]==0)a[j]=0; }cout<<endl;for (i=1,n=0;i<=100;i++){if (a[i]!=0){cout<<setw(5)<<a[i]<<" ";n++;}if(n==10){cout<<endl;n=0;}}cout<<endl;return 0;}5.2题#include <iostream>using namespace std;//#include <math.h>int main(){int i,j,min,temp,a[11];cout<<"enter data:"<<endl;for (i=1;i<=10;i++){cout<<"a["<<i<<"]=";cin>>a[i]; //输入10个数}cout<<endl<<"The original numbers:"<<endl;;for (i=1;i<=10;i++)cout<<a[i]<<" "; // 输出这10个数cout<<endl;;for (i=1;i<=9;i++) //以下8行是对10个数排序{min=i;for (j=i+1;j<=10;j++)if (a[min]>a[j]) min=j;temp=a[i]; //以下3行将a[i+1]～a[10]中最小者与a[i] 对换a[i]=a[min];a[min]=temp;}cout<<endl<<"The sorted numbers:"<<endl;for (i=1;i<=10;i++) // 输出已排好序的10个数cout<<a[i]<<" ";cout<<endl;return 0;}5.3题#include <iostream>using namespace std;int main(){int a[3][3],sum=0;int i,j;cout<<"enter data:"<<endl;;for (i=0;i<3;i++)for (j=0;j<3;j++)cin>>a[i][j];for (i=0;i<3;i++)sum=sum+a[i][i];cout<<"sum="<<sum<<endl;return 0;}5.4题#include <iostream>using namespace std;int main(){int a[11]={1,4,6,9,13,16,19,28,40,100};int num,i,j;cout<<"array a:"<<endl;for (i=0;i<10;i++)cout<<a[i]<<" ";cout<<endl;;cout<<"insert data:";cin>>num;if (num>a[9])a[10]=num;else。
1.5请参照本章例题编写一个C程序输出以下信息**************************Very Good!**************************解mian(){printf(“**************************”);printf(“\n”);printf(“Very Good!\n”);printf(“\n”);printf(“**************************”);}1.6 编写一个程序输入a、b、c三个值输出其中最大值。
解mian(){int a,b,c,max;printf(“请输入三个数a,b,c:\n”);scanf(“%d,%d,%d”,&a,&b,&c);max=a;if(max<b)max=b;if(max<c)max=c;printf(“最大数为“%d”,max);}第三章3.6写出以下程序运行的结果。
main(){char c1=’a’,c2=’b’,c3=’c’,c4=’\101’,c5=’\116’;printf(“a%cb%c\tc%c\tabc\n”,c1,c2,c3);printf(“\t\b%c %c”,c4,c5);}解aaㄩbbㄩㄩㄩccㄩㄩㄩㄩㄩㄩabcAㄩN3.7 要将"China"译成密码译码规律是用原来字母后面的第4个字母代替原来的字母例如字母"A"后面第4个字母是"E""E"代替"A"。
因此"China"应译为"Glmre"。
请编一程序用赋初值的方法使cl、c2、c3、c4、c5五个变量的值分别为’C’、’h’、’i’、’n’、’a’经过运算使c1、c2、c3、c4、c5分别变为’G’、’l’、’m’、’r’、’e’并输出。
谭浩强C语言程序设计习题参考答案第一章1.6main(){int a,b,c,max;printf("input three numbers:\n");scanf("%d,%d,%d",&a,&b,&c);max=a;if(max<b)max=b;if(max<c)max=c;printf("max=%d",max);}第二章2.3(1)(10)10=(12)8=(a)16(2)(32)10=(40)8=(20)16(3)(75)10=(113)8=(4b)16(4)(-617)10=(176627)8=(fd97)16(5)(-111)10=(177621)8=(ff91)16(6)(2483)10=(4663)8=(963)16(7)(-28654)10=(110022)8=(9012)16(8)(21003)10=(51013)8=(520b)162.6aabb (8)cc (8)abc(7)AN2.7main(){char c1='C',c2='h',c3='i',c4='n',c5='a';c1+=4, c2+=4, c3+=4, c4+=4, c5+=4;printf("%c%c%c%c%c\n",c1,c2,c3,c4,c5);}2.8main(){int c1,c2;c1=97;c2=98;printf("%c %c",c1,c2);}2.9(1)=2.5(2)=3.52.109,11,9,102.12(1)24 (2)10 (3)60 (4)0 (5)0 (6)0第三章3.4main(){int a,b,c;long int u,n;float x,y,z;char c1,c2;a=3;b=4;c=5;x=1.2;y=2.4;z=-3.6;u=51274;n=128765;c1='a';c2='b';printf("\n");printf("a=%2d b=%2d c=%2d\n",a,b,c);printf("x=%8.6f,y=%8.6f,z=%9.6f\n",x,y,z);printf("x+y=%5.2f y+z=%5.2f z+x=%5.2f\n",x+y,y+z,z+x);printf("u=%6ld n=%9ld\n",u,n);printf("c1='%c'or %d(ASCII)\n",c1,c1);printf("c2='%c'or %d(ASCII)\n",c2,c2);}3.5575 767.856400,-789.12396267.856400,-789.12396267.86 -789.12,67.856400,-789.123962,67.856400,-789.1239626.785640e+001,-7.89e+002A,65,101,411234567,4553207,d68765535,177777,ffff,-1COMPUTER, COM3.6a=3 b=7/x=8.5 y=71.82/c1=A c2=a/3.710 20Aa1.5 -3.75 +1.4,67.8/(空3)10(空3)20Aa1.5(空1)-3.75(空1)(随意输入一个数），67.8回车3.8main(){float pi,h,r,l,s,sq,sv,sz;pi=3.1415926;printf("input r,h\n");scanf("%f,%f",&r,&h);l=2*pi*r;s=r*r*pi;sq=4*pi*r*r;sv=4.0/3.0*pi*r*r*r;sz=pi*r*r*h;printf("l=%6.2f\n",l);printf("s=%6.2f\n",s);printf("sq=%6.2f\n",sq);printf("vq=%6.2f\n",sv);printf("vz=%6.2f\n",sz);}3.9main(){float c,f;scanf("%f",&f);c=(5.0/9.0)*(f-32);printf("c=%5.2f\n",c);}3.10#include"stdio.h"main(){char c1,c2;scanf("%c,%c",&c1,&c2);putchar(c1);putchar(c2);printf("\n");printf("%c%c\n",c1,c2);}第四章4.3(1)0 (2)1 (3)1 (4)0 (5)1 4.4main(){int a,b,c;scanf("%d,%d,%d",&a,&b,&c); if(a<b)if(b<c)printf("max=%d\n",c);elseprintf("max=%d\n",b);else if(a<c)printf("max=%d\n",c);elseprintf("max=%d\n",a);}main(){int a,b,c,temp,max;scanf("%d,%d,%d",&a,&b,&c);temp=(a>b)?a:b;max=(c>temp)?c:temp;printf("max=%d",max);}4.5main(){int x,y;scanf("%d",&x);if(x<1)y=x;else if(x<10)y=2*x-1;else y=3*x-11;printf("y=%d",y);}4.6main(){int score,temp,logic;char grade;logic=1;while(logic){scanf("%d",&score);if(score>=0&&score<=100)logic=0; }if(score==100)temp=9;elsetemp=(score-score%10)/10;switch(temp){case 9:grade='A';break;case 8:grade='B';break;case 7:grade='C';break;case 6:grade='D';break;case 5:case 4:case 3:case 2:case 1:case 0:grade='E';}printf("score=%d,grade=%c",score,grade);}4.7main(){long int num;int indiv,ten,hundred,thousand,ten_thousand,place;scanf("%ld",&num);if(num>9999) place=5;else if(num>999) place=4;else if(num>99) place=3;else if(num>9) place=2;else place=1;printf("place=%d\n",place);ten_thousand=num/10000;thousand=(num-ten_thousand*10000)/1000;hundred=(num-ten_thousand*10000-thousand*1000)/100;ten=(num-ten_thousand*10000-thousand*1000-hundred*100)/10;indiv=num-ten_thousand*10000-thousand*1000-hundred*100-ten*10;switch(place){case 5:printf("%d,%d,%d,%d,%d\n",ten_thousand,thousand,hundred,ten,indiv);printf("%d,%d,%d,%d,%d\n",indiv,ten,hundred,thousand,ten_thousand);break;case 4:printf("%d,%d,%d,%d\n",thousand,hundred,ten,indiv);printf("%d,%d,%d,%d\n",indiv,ten,hundred,thousand);break;case 3:printf("%d,%d,%d\n",hundred,ten,indiv);printf("%d,%d,%d\n",indiv,ten,hundred);break;case 2:printf("%d,%d\n",ten,indiv);printf("%d,%d\n",indiv,ten);break;case 1:printf("%d\n",indiv);printf("%d\n",indiv);}}4.8main(){long i;float bonus,bon1,bon2,bon4,bon6,bon10;bon1=100000*0.1;bon2=bon1+100000*0.075;bon4=bon2+200000*0.05;bon6=bon4+200000*0.03;bon10=bon6+400000*0.015;scanf("%ld",&i);if(i<=1e5)bonus=i*0.1;else if(i<=2e5)bonus=bon1+(i-100000)*0.075; else if(i<=4e5)bonus=bon2+(i-200000)*0.05; else if(i<=6e5)bonus=bon4+(i-400000)*0.03; else if(i<=1e6)bonus=bon6+(i-600000)*0.015; else bonus=bon10+(i-1000000)*0.01;printf("bonus=%10.2f",bonus);}main(){long i;float bonus,bon1,bon2,bon4,bon6,bon10;int branch;bon1=100000*0.1;bon2=bon1+100000*0.075;bon4=bon2+200000*0.05;bon6=bon4+200000*0.03;bon10=bon6+400000*0.015;scanf("%ld",&i);branch=i/100000;if(branch>10)branch=10;switch(branch){case 0:bonus=i*0.1;break;case 1:bonus=bon1+(i-100000)*0.075;break; case 2:case 3:bonus=bon2+(i-200000)*0.05;break; case 4:case 5:bonus=bon4+(i-400000)*0.03;break; case 6:case 7case 8:case 9:bonus=bon6+(i-600000)*0.015;break; case 10:bonus=bon10+(i-1000000)*0.01;}printf("bonus=%10.2f",bonus);}4.9main(){int t,a,b,c,d;scanf("%d,%d,%d,%d",&a,&b,&c,&d);if(a>b){t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(a>d){t=a;a=d;d=t;}if(b>c){t=b;b=c;c=t;}if(b>d){t=b;b=d;d=t;}if(c>d){t=c;c=d;d=t;}printf("%d %d %d %d\n",a,b,c,d);}4.10main(){int h=10;float x,y,x0=2,y0=2,d1,d2,d3,d4;scanf("%f,%f",&x,&y);d1=(x-x0)*(x-x0)+(y-y0)*(y-y0);d2=(x-x0)*(x-x0)+(y+y0)*(y+y0);d3=(x+x0)*(x+x0)+(y-y0)*(y-y0);d4=(x+x0)*(x+x0)+(y+y0)*(y+y0);if(d1>1&&d2>1&&d3>1&&d4>1)h=0;printf("h=%d",h);}第五章循环控制5.1main(){int a,b,num1,num2,temp;scanf("%d,%d",&num1,&num2);if(num1<num2){temp=num1;num1=num2;num2=temp;}a=num1;b=num2;while(b!=0){temp=a%b;a=b;b=temp;}printf("%d\n",a);printf("%d\n",num1*num2/a);}5.2#include"stdio.h"main(){char c;int letters=0,space=0,digit=0,other=0;while((c=getchar())!='\n'){if(c>='a'&&c<='z'||c>='A'&&c<='Z') letters++;else if(c==' ')space++;else if(c>='0'&&c<='9')digit++;else other++;}printf("letters=%d\nspace=%d\ndigit=%d\nother=%d\n",letters,space,digit,other); }main(){int a,n,count=1,sn=0,tn=0;scanf("%d,%d",&a,&n);while(count<=n){tn+=a;sn+=tn;a*=10;++count;}printf("a+aa+aaa+...=%d\n",sn);}5.4main(){float n,s=0,t=1;for(n=1;n<=20;n++){t*=n;s+=t;}printf("s=%e\n",s);}5.5main(){int N1=100,N2=50,N3=10;float k;float s1=0,s2=0,s3=0;for(k=1;k<=N1;k++)s1+=k;for(k=1;k<=N2;k++)s2+=k*k;for(k=1;k<=N3;k++)s3+=1/k;printf("s=%8.2f\n",s1+s2+s3);}5.6main(){int i,j,k,n;for(n=100;n<1000;n++){i=n/100;j=n/10-i*10;k=n%10;if(i*100+j*10+k==i*i*i+j*j*j+k*k*k) printf("n=%d\n",n);}}5.7#define M 1000{int k0,k1,k2,k3,k4,k5,k6,k7,k8,k9; int i,j,n,s;for(j=2;j<=M;j++){n=0;s=j;for(i=1;i<j;i++){if((j%i)==0){n++;s=s-i;switch(n){case 1:k0=i;break;case 2:k1=i;break;case 3:k2=i;break;case 4:k3=i;break;case 5:k4=i;break;case 6:k5=i;break;case 7:k6=i;break;case 8:k7=i;break;case 9:k8=i;break;case 10:k9=i;break;}}}if(s==0){printf("j=%d\n",j);if(n>1)printf("%d,%d",k0,k1);if(n>2)printf(",%d",k2);if(n>3)printf(",%d",k3);if(n>4)printf(",%d",k4);if(n>5)printf(",%d",k5);if(n>6)printf(",%d",k6);if(n>7)printf(",%d",k7);if(n>8)printf(",%d",k8);if(n>9)printf(",%d\n",k9);}}}main(){static int k[10];int i,j,n,s;for(j=2;j<=1000;j++){n=-1;s=j;for(i=1;i<j;i++){if((j%i)==0){n++;s=s-i;k[n]=i;}}if(s==0){printf("j=%d\n",j);for(i=0;i<n;i++)printf("%d,",k[i]);printf("%d\n",k[n]);}}}5.8main(){int n,t,number=20;float a=2;b=1;s=0;for(n=1;n<=number;n++) {s=s+a/b;t=a,a=a+b,b=t;}printf("s=%9.6f\n",s);}5.9main(){float sn=100.0,hn=sn/2; int n;for(n=2;n<=10;n++) {sn=sn+2*hn;hn=hn/2;}printf("sn=%f\n",sn);printf("hn=%f\n",hn);}5.10main(){int day,x1,x2;day=9;x2=1;while(day>0){x1=(x2+1)*2;x2=x1;day--;}printf("x1=%d\n",x1);}5.11#include"math.h"main(){float a,xn0,xn1;scanf("%f",&a);xn0=a/2;xn1=(xn0+a/xn0)/2;do{xn0=xn1;xn1=(xn0+a/xn0)/2;}while(fabs(xn0-xn1)>=1e-5);printf("a=%5.2f\n,xn1=%8.2f\n",a,xn1); }5.12#include"math.h"main(){float x,x0,f,f1;x=1.5;do{x0=x;f=((2*x0-4)*x0+3)*x0-6;f1=(6*x0-8)*x0+3;x=x0-f/f1;}while(fabs(x-x0)>=1e-5);printf("x=%6.2f\n",x);}5.13#include"math.h"main(){float x0,x1,x2,fx0,fx1,fx2;do{scanf("%f,%f",&x1,&x2);fx1=x1*((2*x1-4)*x1+3)-6;fx2=x2*((2*x2-4)*x2+3)-6;}while(fx1*fx2>0);do{x0=(x1+x2)/2;fx0=x0*((2*x0-4)*x0+3)-6;if((fx0*fx1)<0){x2=x0;fx2=fx0;}else{x1=x0;fx1=fx0;}}while(fabs(fx0)>=1e-5);printf("x0=%6.2f\n",x0);}5.14main(){int i,j,k;for(i=0;i<=3;i++){for(j=0;j<=2-i;j++)printf(" ");for(k=0;k<=2*i;k++)printf("*");printf("\n");}for(i=0;i<=2;i++){for(j=0;j<=i;j++)printf(" ");for(k=0;k<=4-2*i;k++)printf("*");printf("\n");}}5.15main(){char i,j,k;for(i='x';i<='z';i++)for(j='x';j<='z';j++){if(i!=j)for(k='x';k<='z';k++){if(i!=k&&j!=k){if(i!='x'&&k!='x'&&k!='z')printf("\na--%c\tb--%c\tc--%c\n",i,j,k);}}}}第六章数组6.1#include <math.h>#define N 101main(){ int i,j,line,a[N];for (i=2;i<N;i++) a[i]=i; for (i=2;i<sqrt(N);i++)for (j=i+1;j<N;j++){if(a[i]!=0 && a[j]!=0)if (a[j]%a[i]==0)a[j]=0; }printf("\n");for (i=2,line=0;i<N;i++) { if(a[i]!=0){ printf("%5d",a[i]);line++; }if(line==10){ printf("\n");line=0; }}}6.2#define N 10main(){int i,j,min,temp,a[N];for(i=0;i<N;i++)scanf("%d",&a[i]);for(i=0;i<N-1;i++){min=i;for(j=i+1;j<N;j++)if(a[min]>a[j])min=j;temp=a[i];a[i]=a[min];a[min]=temp;}for(i=0;i<N;i++)printf("%5d",a[i]);}6.3main(){float a[3][3],sum;int i,j;for(i=0;i<3;i++)for(j=0;j<3;j++){scanf("%f",&sum);a[i][j]=sum;}for(i=0;i<3;i++)sum=sum+a[i][i];printf("sum=%f",sum);}6.4main(){int a[11]={1,4,6,9,13,16,19,28,40,100}; int temp1,temp2,number, end,i,j;scanf("%d",&number);end=a[9];if(number>end) a[10]=number;else{for(i=0;i<10;i++){if(a[i]>number){temp1=a[i];a[i]=number;for(j=i+1;j<11;j++){temp2=a[j];a[j]=temp1;temp1=temp2;}break;}}}for(i=0;i<11;i++)printf("%6d",a[i]);}6.5#define N 5main(){int a[N]={8,6,5,4,1},i,temp;for(i=0;i<N/2;i++){temp=a[i];a[i]=a[N-i-1];a[N-i-1]=temp;}for(i=0;i<N;i++)printf("%4d",a[i]);}6.6#define N 11main(){int i,j,a[N][N];for(i=1;i<N;i++){a[i][i]=1;a[i][1]=1;}for(i=3;i<N;i++)for(j=2;j<i;j++)a[i][j]=a[i-1][j-1]+a[i-1][j];for(i=1;i<N;i++){for(j=1;j<=i;j++)printf("%6d",a[i][j]);printf("\n");}}6.7main(){int a[16][16],i,j,k,p,m,n;p=1;while(p==1){scanf("%d",&n);if((n!=0)&&(n<=15)&&(n%2!=0))p=0; }for(i=1;i<=n;i++)for(j=1;j<=n;j++)a[i][j]=0;j=n/2+1;a[1][j]=1;for(k=2;k<=n*n;k++){i=i-1;j=j+1;if((i<1)&&(j>n)){i=i+2;j=j-1;}else{if(i<1)i=n;if(j>n)j=1;}if(a[i][j]==0)a[i][j]=k;else{i=i+2;j=j-1;a[i][j]=k;}}for(i=1;i<=n;i++){for(j=1;j<=n;j++)printf("%3d",a[i][j]);printf("\n");}}6.8#define N 10#define M 10main(){int i,j,k,m,n,flag1,flag2,a[N][M],max,maxi,maxj; scanf("%d,%d",&n,&m);for(i=0;i<n;i++)for(j=0;j<m;j++)scanf("%d",&a[i][j]);flag2=0;for(i=0;i<n;i++){max=a[i][0];for(j=0;j<m;j++)if(max<a[i][j]){max=a[i][j];maxj=j;}for(k=0,flag1=1;k<n&&flag1;k++)if(max>a[k][maxj])flag1=0;if(flag1){ printf("\na[%d][%d]=%d\n",i,maxj,max);flag2=1;}}if(!flag2) printf("NOT");}6.9#include<stdio.h>#define N 15main(){int i,j,number,top,bott,min,loca,a[N],flag;char c;for(i=0;i<=N;i++)scanf("%d",&a[i]);flag=1;while(flag){scanf("%d",&number);loca=0;top=0;bott=N-1;if((number<a[0])||(number>a[N-1]))loca=-1;while((loca==0)&&(top<=bott)){min=(bott+top)/2;if(number==a[min]){loca=min;printf("number=%d,loca=%d\n",number,loca+1);}else if(number<a[min])bott=min-1;elsetop=min+1;}if(loca==0||loca==-1)printf("%d not in table\n",number);printf("continue Y/N or y/n\n");c=getchar();if(c=='N'||c=='n')flag=0;}}6.10main(){int i,j,uppn,lown,dign,span,othn;char text[3][80];uppn=lown=dign=span=othn=0;for(i=0;i<3;i++){gets(text[i]);for(j=0;j<80&&text[i][j]!='\0';j++){if(text[i][j]>='A'&&text[i][j]<='Z')uppn++;else if(text[i][j]>='a'&&text[i][j]<='z')lown++;else if(text[i][j]>='0'&&text[i][j]<='9')dign++;else if(text[i][j]==' ')span++;elseothn++;}}for(i=0;i<3;i++)printf("%s\n",text[i]);printf("uppn=%d\n",uppn);printf("lown=%d\n",lown);printf("dign=%d\n",dign);printf("span=%d\n",span);printf("othn=%d\n",othn);}6.11main(){static char a[5]={'*','*','*','*','*'};int i,j,k;char space=' ';for(i=0;i<=5;i++){printf("\n");for(j=1;j<=3*i;j++)printf("%1c",space);for(k=0;k<=5;k++)printf("%3c",a[k]);}}6.12#include<stdio.h>main(){int i,n;char ch[80],tran[80];gets(ch);i=0;while(ch[i]!='\0'){if((ch[i]>='A')&&(ch[i]<='Z'))tran[i]=26+64-ch[i]+1+64;else if((ch[i]>='a')&&(ch[i]<='z'))tran[i]=26+96-ch[i]+1+96;elsetran[i]=ch[i];i++;}n=i;for(i=0;i<n;i++)putchar(tran[i]);}6.13main(){char s1[80],s2[40];int i=0,j=0;scanf("%s",s1);scanf("%s",s2);while(s1[i]!='\0')i++;while(s2[j]!='\0')s1[i++]=s2[j++];s1[i]='\0';printf("s=%s\n",s1);}6.14#include<stdio.h>main(){int i,resu;char s1[100],s2[100];gets(s1);gets(s2);i=0;while((s1[i]==s2[i])&&(s1[i]!='\0'))i++;if(s1[i]=='\0'&&s2[i]=='\0')resu=0;elseresu=s1[i]-s2[i];printf("s1=%s,s2=%s,resu=%d\n",s1,s2,resu); }6.15#include"stdio.h"main(){char from[80],to[80];;int i;scanf("%s",from);for(i=0;i<=strlen(from);i++)to[i]=from[i];printf("%s\n",to);}第七章7.1hcf(u,v)int u,v;{int a,b,t,r;if(u>v){t=u;u=v;v=t;}a=u;b=v;while((r=b%a)!=0){b=a;a=r;}return(a);}lcd(u,v,h)int u,v,h;{return(u*v/h);}main(){int u,v,h,l;scanf("%d,%d",&u,&v);h=hcf(u,v);printf("H.C.F=%d\n",h);l=lcd(u,v,h);printf("L.C.D=%d\n",l);}7.2#include"math.h"float x1,x2,disc,p,q;greater_than_zero(a,b)float a,b;{x1=(-b+sqrt(disc))/(2*a);x2=(-b-sqrt(disc))/(2*a);}equal_to_zero(a,b)flaot a,b;{x1=x2=-b/(2*a);}smaller_than_zero(a,b)float a,b;{p=-b/(2*a);q=sqrt(-disc)/(2*a);}main(){float a,b,c;scanf("%f,%f,%f",&a,&b,&c);disc=b*b-4*a*c;if(fabs(disc)<=1e-5){equal_to_zero(a,b);printf("x1=%5.2f\tx2=%5.2f\n",x1,x2); }else if(disc>0){greater_than_zero(a,b);printf("x1=%5.2f\tx2=%5.2f\n",x1,x2); }else{smaller_than_zero(a,b);printf("x1=%5.2f+%5.2fi\tx2=%5.2f-%5.2fi\n",p,q,p,q); }}7.3main(){int number;scanf("%d",&number);if(prime(number))printf("yes");elseprintf("no");}int prime(number)int number;{int flag=1,n;for(n=2;n<number/2&&flag==1;n++)if(number%n==0)flag=0;return(flag);}7.4#define N 3int array[N][N];convert(array)int array[3][3];{int i,j,t;for(i=0;i<N;i++)for(j=i+1;j<N;j++){t=array[i][j];array[i][j]=array[j][i];array[j][i]=t;}}main(){int i,j;for(i=0;i<N;i++)for(j=0;j<N;j++)scanf("%d",&array[i][j]);convert(array);for(i=0;i<N;i++){printf("\n");for(j=0;j<N;j++)printf("%5d",array[i][j]);}}7.5main(){char str[100];scanf("%s",str);inverse(str);printf("%s\n",str);}inverse(str)char str[];{char t;int i,j;for(i=0,j=strlen(str);i<strlen(str)/2;i++,j--) {t=str[i];str[i]=str[j-1];str[j-1]=t;}}7.6char concate(str1,str2,str)char str1[],str2[],str[];{int i,j;for(i=0;str1[i]!='\0';i++)str[i]=str1[i];for(j=0;str2[j]!='\0';j++)str[i+j]=str2[j];str[i+j]='\0';}main(){char s1[100],s2[100],s[100];scanf("%s",s1);scanf("%s",s2);concate(s1,s2,s);printf("\ns=%s",s);}7.7main(){char str[80],c[80];void cpy();gets(str);cpy(str,c);printf("\n%s\n",c);}void cpy(s,c)char s[],c[];{int i,j;for(i=0,j=0;s[i]!='\0';i++)if(s[i]=='a'||s[i]=='A'||s[i]=='e'||s[i]=='E'||s[i]=='i'||s[i]=='I'||s[i]=='o'||s[i]=='O'||s[i]=='u'||s[i]=='U'){c[j]=s[i];j++;}c[j]='\0';}7.8main(){char str[80];scanf("%s",str);insert(str);}insert(str)char str[];{int i;for(i=strlen(str);i>0;i--){str[i*2]=str[i];str[i*2-1]=' ';}printf("%s\n",str);}7.9int alph,digit,space,others;main(){char text[80];gets(text);alph=0,digit=0,space=0,others=0;count(text);printf("\nalph=%d,digit=%d,space=%d,others=%d\n",alph,digit,space,others); }count(str)char str[];{int i;for(i=0;str[i]!='\0';i++)if((str[i]>='a'&&str[i]<='z')||(str[i]>='A'&&str[i]<='Z'))alph++;else if(str[i]>='0'&&str[i]<='9')digit++;else if(strcmp(str[i],' ')==0)space++;elseothers++;}7.10int alph(c)char c;{if((c>='a'&&c<='z')||(c>='A'&&c<='Z')) return(1);elsereturn(0);}int longest(string)char string[];{int len=0,i,length=0,flag=1,place,point; for(i=0;i<=strlen(string);i++)if(alph(string[i]))if(flag){point=i;flag=0;}elselen++;else{flag=1;if(len>length){length=len;place=point;len=0;}}return(place);}main(){int i;char line[100];gets(line);for(i=longest(line);alph(line[i]);i++) printf("%c",line[i]);printf("\n");}7.11#define N 10char str[N];main(){int i,flag;for(flag=1;flag==1;){scanf("%s",str);if(strlen(str)>N)printf("input error");elseflag=0;}sort(str);for(i=0;i<N;i++)printf("%c",str[i]);}sort(str)char str[N];{int i,j;char t;for(j=1;j<N;j++)for(i=0;(i<N-j)&&(str[i]!='\0');i++)if(str[i]>str[i+1]){t=str[i];str[i]=str[i+1];str[i+1]=t;}}7.12#include<math.h>float solut(a,b,c,d)float a,b,c,d;{float x=1,x0,f,f1;do{x0=x;f=((a*x0+b)*x0+c)*x0+d;f1=(3*a*x0+2*b)*x0+c;x=x0-f/f1;}while(fabs(x-x0)>=1e-5);return(x);}main(){float a,b,c,d;scanf("%f,%f,%f,%f",&a,&b,&c,&d); printf("x=%10.7f\n",solut(a,b,c,d)); }7.13main(){int x,n;scanf("%d,%d",&n,&x);printf("P%d(%d)=%10.2f\n",n,x,p(n,x));}float p(tn,tx)int tn,tx;{if(tn==0)return(1);else if(tn==1)return(tx);elsereturn(((2*tn-1)*tx*p((tn-1),tx)-(tn-1)*p((tn-2),tx))/tn); }7.14#define N 10#define M 5float score[N][M];float a_stu[N],a_cor[M];main(){int i,j,r,c;float h;float s_diff();float highest();r=0;c=1;input_stu();avr_stu();avr_cor();printf("\n number class 1 2 3 4 5 avr");for(i=0;i<N;i++){printf("\nNO%2d",i+1);for(j=0;j<M;j++)printf("%8.2f",score[i][j]);printf("%8.2f",a_stu[i]);}printf("\nclassavr");for(j=0;j<M;j++)printf("%8.2f",a_cor[j]);h=highest(&r,&c);printf("\n\n%8.2f %d %d\n",h,r,c);printf("\n %8.2f\n",s_diff());}input_stu(){int i,j;for(i=0;i<N;i++){for(j=0;j<M;j++){scanf("%f",&x);score[i][j]=x;}}}avr_stu(){int i,j;float s;for(i=0;i<N;i++){for(j=0,s=0;j<M;j++)s+=score[i][j];a_stu[i]=s/5.0;}}avr_cor(){int i,j;float s;for(j=0;j<M;j++){for(i=0,s=0;i<N;i++)s+=score[i][j];a_cor[j]=s/(float)N;}}float highest(r,c)int *r,*c;{float high;int i,j;high=score[0][0];for(i=0;i<N;i++)for(j=0;j<M;j++)if(score[i][j]>high){high=score[i][j];*r=i+1;*c=j+1;}return(high);}float s_diff(){int i,j;float sumx=0.0,sumxn=0.0; for(i=0;i<N;i++){sumx+=a_stu[i]*a_stu[i];sumxn+=a_stu[i];}return(sumx/N-(sumxn/N)*(sumxn/N)); }7.15#include<stdio.h>#define N 10void input_e(num,name)int num[];char name[N][8];{int i;for(i=0;i<N;i++){scanf("%d",&num[i]);gets(name[i]);}}void sort(num,name)int num[];char name[N][8];{int i,j,min,temp1;char temp2[8];for(i=0;i<N-1;i++){min=i;for(j=i;j<N;j++)if(num[min]>num[j])min=j;temp1=num[i];num[i]=num[min];num[min]=temp1;strcpy(temp2,name[i]);strcpy(name[i],name[min]);strcpy(name[min],temp2);}for(i=0;i<N;i++)printf("\n%5d%10s",num[i],name[i]); }void search(n,num,name)int n,num[];char name[N][8];{int top,bott,min,loca;loca=0;top=0;bott=N-1;if((n<num[0])||(n>num[N-1]))while((loca==0)&&(top<=bott)){min=(bott+top)/2;if(n==num[min]){loca=min;printf("number=%d,name=%s\n",n,name[loca]);}else if(n<num[min])bott=min-1;elsetop=min+1;}if(loca==0||loca==-1)printf("number=%d is not in table\n",n);}main(){int num[N],number,flag,c,n;char name[N][8];input_e(num,name);sort(num,name);for(flag=1;flag;){scanf("%d",&number);search(number,num,name);printf("continue?Y/N!");c=getchar();if(c=='N'||c=='n')flag=0;}}7.16#include<stdio.h>#define MAX 1000main(){int c,i,flag,flag1;char t[MAX];i=0;flag=0;flag1=1;while((c=getchar())!='\0'&&i<MAX&&flag1){if(c>='0'&&c<='9'||c>='A'&&c<='F'||c>='a'&&c<='f') {flag=1;t[i++]=c;}else if(flag)printf("\nnumber=%d\n",htoi(t));printf("continue?");c=getchar();if(c=='n'||c=='N')flag1=0;else{flag=0;i=0;}}}}htoi(s)char s[];{int i,n;n=0;for(i=0;s[i]!='\0';i++){if(s[i]>='0'&&s[i]<='9')n=n*16+s[i]-'0';if(s[i]>='a'&&s[i]<='f')n=n*16+s[i]-'a'+10;if(s[i]>='A'&&s[i]<='F')n=n*16+s[i]-'A'+10;}return(n);}7.17#include<stdio.h>void convert(n)int n;{int i;if((i=n/10)!=0)convert(i);putchar(n%10+'0');}main(){int number;scanf("%d",&number);if(number<0){putchar('-');number=-number;}convert(number);}7.18main(){int year,month,day;int days;scanf("\n%d,%d,%d",&year,&month,&day);days=sum_day(month,day);if(leap(year)&&(month>=3))days+=1;printf("days=%d\n",days);}static int day_tab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31} int sum_day(month,day)int month,day;{int i;for(i=1;i<month;i++)day+=day_tab[i];return(day);}int leap(year)int year;{int leap;leap=year%4==0&&year%100!=0||year%400==0;return(leap);}第八章编译预处理8.1#define SW AP(a,b) t=b;b=a;a=tmain(){int a,b,t;scanf("%d,%d",&a,&b);SWAP(a,b);printf("a=%d\tb=%d\n",a,b);}8.2#define SURPLUS(a,b) ((a)%(b))main(){int a,b;scanf("%d,%d",&a,&b);printf("%d",SURPLUS(a,b));}8.3#include"math.h"#define S(a,b,c) ((a+b+c)/2)。
第1章程序设计和C语言1什么是计算机程序1什么是计算机语言1语言的发展及其特点3最简单的C语言程序5最简单的C语言程序举例6语言程序的结构10运行C程序的步骤与方法12程序设计的任务141-5 #include <>int main ( ){ printf ("**************************\n\n"); printf(" Very Good!\n\n");printf ("**************************\n"); return 0;}1-6#include <>int main(){int a,b,c,max;printf("please input a,b,c:\n");scanf("%d,%d,%d",&a,&b,&c);max=a;if (max<b)max=b;if (max<c)max=c;printf("The largest number is %d\n",max); return 0;}第2章算法——程序的灵魂16什么是算法16简单的算法举例17算法的特性21怎样表示一个算法22用自然语言表示算法22用流程图表示算法22三种基本结构和改进的流程图26用N S流程图表示算法28用伪代码表示算法31用计算机语言表示算法32结构化程序设计方法34习题36第章最简单的C程序设计——顺序程序设计37顺序程序设计举例37数据的表现形式及其运算39常量和变量39数据类型42整型数据44字符型数据47浮点型数据49怎样确定常量的类型51运算符和表达式52语句57语句的作用和分类57最基本的语句——赋值语句59数据的输入输出65输入输出举例65有关数据输入输出的概念67用printf函数输出数据68用scanf函数输入数据75字符数据的输入输出78习题823-1 #include <>#include <>int main(){float p,r,n;r=;n=10;p=pow(1+r,n);printf("p=%f\n",p);return 0;}3-2-1#include <>#include <>int main(){float r5,r3,r2,r1,r0,p,p1,p2,p3,p4,p5; p=1000;r5=;r3=;r2=;r1=;r0=;p1=p*((1+r5)*5); #include <> #include <>int main(){float d=300000,p=6000,r=,m;m=log10(p/(p-d*r))/log10(1+r);printf("m=%\n",m);return 0;}3-4#include <>int main(){int c1,c2;c1=197;c2=198;printf("c1=%c,c2=%c\n",c1,c2);printf("c1=%d，c2=%d\n",c1,c2);return 0;3-5#include <>int main(){int a,b;float x,y;char c1,c2;scanf("a=%d b=%d",&a,&b);scanf("%f %e",&x,&y);scanf("%c%c",&c1,&c2);printf("a=%d,b=%d,x=%f,y=%f,c1=%c,c2=%c\n",a,b,x,y,c1,c2); return 0;}3-6#include <>int main(){char c1='C',c2='h',c3='i',c4='n',c5='a';c1=c1+4;c2=c2+4;c3=c3+4;c4=c4+4;c5=c5+4;printf("passwor is %c%c%c%c%c\n",c1,c2,c3,c4,c5);return 0;}#include <>int main (){float h,r,l,s,sq,vq,vz;float pi=;printf("请输入圆半径r，圆柱高h∶");scanf("%f,%f",&r,&h); #include <> int main(){ int x,y;printf("输入x:");scanf("%d",&x);if(x<1) /* x<1 */{ y=x;printf("x=%3d, y=x=%d\n" ,x,y);}else if(x<10) /* 1=<x<10 */{ y=2*x-1;printf("x=%d, y=2*x-1=%d\n",x,y);}else /* x>=10 */{ y=3*x-11;printf("x=%d, y=3*x-11=%d\n",x,y);}return 0;}#include <>int main(){int x,y;printf("enter x:");scanf("%d",&x);y=-1;if(x!=0)if(x>0)y=1;elsey=0;printf("x=%d,y=%d\n",x,y); return 0;}4-7-2#include <>int main(){int x,y;printf("please enter x:"); scanf("%d",&x);y=0;if(x>=0)if(x>0) y=1;else y=-1;printf("x=%d,y=%d\n",x,y); return 0;}4-8#include <>int main(){ float score;char grade;printf("请输入学生成绩:"); scanf("%f",&score);while (score>100||score<0) {printf("\n 输入有误,请重输"); scanf("%f",&score);}switch((int)(score/10)){case 10:case 9: grade='A';break;case 8: grade='B';break;case 7: grade='C';break;case 6: grade='D';break;case 5:case 4:case 3:case 2:case 1:case 0: grade='E';}printf("成绩是 %,相应的等级是%c\n ",score,grade); return 0;}4-9#include <>#include <>int main(){int num,indiv,ten,hundred,thousand,ten_thousand,place;位,万位和位数printf("请输入一个整数(0-99999):");scanf("%d",&num);if (num>9999)place=5;else if (num>999)place=4;else if (num>99) .=%d\n",sn);return 0;}5-6#include <>int main(){double s=0,t=1;int n;for (n=1;n<=20;n++){t=t*n;s=s+t;}printf("1!+2!+...+20!=%\n",s);return 0;}5-7#include <>int main(){int n1=100,n2=50,n3=10;double k,s1=0,s2=0,s3=0;for (k=1;k<=n1;k++) /*计算1到100的和*/{s1=s1+k;}for (k=1;k<=n2;k++) /*计算1到50各数的平方和*/ {s2=s2+k*k;}for (k=1;k<=n3;k++) /*计算1到10的各倒数和*/ {s3=s3+1/k;}printf("sum=%\n",s1+s2+s3);return 0;}5-8#include <>int main(){int i,j,k,n;printf("parcissus numbers are ");for (n=100;n<1000;n++){i=n/100;j=n/10-i*10;k=n%10;if (n==i*i*i + j*j*j + k*k*k)printf("%d ",n);}printf("\n");return 0;}5-9-1#define M 1000 /*定义寻找范围*/ #include <>int main(){int k1,k2,k3,k4,k5,k6,k7,k8,k9,k10;int i,a,n,s;for (a=2;a<=M;a++) /* a是2-1000之间的整数，检查它是否完数 */{n=0; /* n用来累计a的因子的个数 */s=a; /* s用来存放尚未求出的因子之和，开始时等于a */ for (i=1;i<a;i++) /* 检查i是否a的因子 */if (a%i==0) /* 如果i是a的因子 */{n++; /* n加1，表示新找到一个因子 */s=s-i; /* s减去已找到的因子，s的新值是尚未求出的因子之和 */ switch(n) /* 将找到的因子赋给k1...k9，或k10 */{case 1:k1=i; break; /* 找出的笫1个因子赋给k1 */case 2:k2=i; break; /* 找出的笫2个因子赋给k2 */case 3:k3=i; break; /* 找出的笫3个因子赋给k3 */case 4:k4=i; break; /* 找出的笫4个因子赋给k4 */case 5:k5=i; break; /* 找出的笫5个因子赋给k5 */case 6:k6=i; break; /* 找出的笫6个因子赋给k6 */case 7:k7=i; break; /* 找出的笫7个因子赋给k7 */case 8:k8=i; break; /* 找出的笫8个因子赋给k8 */case 9:k9=i; break; /*找出的笫9个因子赋给k9 */case 10:k10=i; break; /* 找出的笫10个因子赋给k10 */}}if (s==0){printf("%d ,Its factors are ",a);if (n>1) printf("%d,%d",k1,k2); /* n>1表示a至少有2个因子 */if (n>2) printf(",%d",k3); /* n>2表示至少有3个因子，故应再输出一个因子 */if (n>3) printf(",%d",k4); /* n>3表示至少有4个因子，故应再输出一个因子 */if (n>4) printf(",%d",k5); /* 以下类似 */if (n>5) printf(",%d",k6);if (n>6) printf(",%d",k7);if (n>7) printf(",%d",k8);if (n>8) printf(",%d",k9);if (n>9) printf(",%d",k10);printf("\n");}}return 0;}5-9-2#include <>int main(){int m,s,i;for (m=2;m<1000;m++){s=0;for (i=1;i<m;i++)if ((m%i)==0) s=s+i;if(s==m){printf("%d,its factors are ",m); for (i=1;i<m;i++)if (m%i==0) printf("%d ",i); printf("\n");}}return 0;}5-10#include <>int main(){int i,n=20;double a=2,b=1,s=0,t;for (i=1;i<=n;i++){s=s+a/b;t=a,a=a+b,b=t;}printf("sum=%\n",s);return 0;}5-11#include <>int main(){double sn=100,hn=sn/2;int n;for (n=2;n<=10;n++){sn=sn+2*hn; /*第n次落地时共经过的米数*/ hn=hn/2; /*第n次反跳高度*/}printf("第10次落地时共经过%f米\n",sn); printf("第10次反弹%f米\n",hn);return 0;}5-12#include <>int main(){int day,x1,x2;day=9;x2=1;while(day>0){x1=(x2+1)*2; /*第1天的桃子数是第2天桃子数加1后的2倍.*/ x2=x1;day--;}printf("total=%d\n",x1);return 0;}5-13#include <>#include <>int main(){float a,x0,x1;printf("enter a positive number:");scanf("%f",&a);x0=a/2;x1=(x0+a/x0)/2;do{x0=x1;x1=(x0+a/x0)/2;}while(fabs(x0-x1)>=1e-5);printf("The square root of % is %\n",a,x1); return 0;}5-14#include <>#include <>int main(){double x1,x0,f,f1;x1=;do{x0=x1;f=((2*x0-4)*x0+3)*x0-6;f1=(6*x0-8)*x0+3;x1=x0-f/f1;}while(fabs(x1-x0)>=1e-5);printf("The root of equation is %\n",x1); return 0;}5-15#include <>#include <>int main(){float x0,x1,x2,fx0,fx1,fx2;do{printf("enter x1 & x2:"); scanf("%f,%f",&x1,&x2);fx1=x1*((2*x1-4)*x1+3)-6; fx2=x2*((2*x2-4)*x2+3)-6; }while(fx1*fx2>0);do{x0=(x1+x2)/2;fx0=x0*((2*x0-4)*x0+3)-6; if ((fx0*fx1)<0){x2=x0;fx2=fx0;}else{x1=x0;fx1=fx0;}}while(fabs (fx0)>=1e-5); printf("x=%\n",x0);return 0;}5-16#include <>int main(){int i,j,k;for (i=0;i<=3;i++){for (j=0;j<=2-i;j++)printf(" ");for (k=0;k<=2*i;k++)printf("*");printf("\n");}for (i=0;i<=2;i++){for (j=0;j<=i;j++)printf(" ");for (k=0;k<=4-2*i;k++)printf("*");printf("\n");}return 0;}5-17#include <>int main(){char i,j,k; /*是a的对手;j是b的对手;k是c的对手*/ for (i='x';i<='z';i++)for (j='x';j<='z';j++)if (i!=j)for (k='x';k<='z';k++)if (i!=k && j!=k)if (i!='x' && k!='x' && k!='z')printf("A--%c\nB--%c\nC--%c\n",i,j,k); return 0;}第6章利用数组处理批量数据142怎样定义和引用一维数组142怎样定义一维数组143怎样引用一维数组元素144一维数组的初始化145一维数组程序举例146怎样定义和引用二维数组148怎样定义二维数组149怎样引用二维数组的元素150二维数组的初始化151二维数组程序举例152字符数组154怎样定义字符数组154字符数组的初始化155怎样引用字符数组中的元素155字符串和字符串结束标志156字符数组的输入输出159使用字符串处理函数161字符数组应用举例165习题1686-1#include <>#include <>int main(){int i,j,n,a[101];for (i=1;i<=100;i++)a[i]=i;a[1]=0;for (i=2;i<sqrt(100);i++) for (j=i+1;j<=100;j++) {if(a[i]!=0 && a[j]!=0) if (a[j]%a[i]==0)a[j]=0;}printf("\n");for (i=2,n=0;i<=100;i++) { if(a[i]!=0){printf("%5d",a[i]);n++;}if(n==10){printf("\n");n=0;}}printf("\n");return 0;}6-2#include <>int main(){int i,j,min,temp,a[11];printf("enter data:\n");for (i=1;i<=10;i++){printf("a[%d]=",i);scanf("%d",&a[i]);}printf("\n");printf("The orginal numbers:\n"); for (i=1;i<=10;i++)printf("%5d",a[i]);printf("\n");for (i=1;i<=9;i++){min=i;for (j=i+1;j<=10;j++)if (a[min]>a[j]) min=j;temp=a[i];a[i]=a[min];a[min]=temp;}printf("\nThe sorted numbers:\n");for (i=1;i<=10;i++)printf("%5d",a[i]);printf("\n");return 0;}6-3#include <>int main(){int a[3][3],sum=0;int i,j;printf("enter data:\n");for (i=0;i<3;i++)for (j=0;j<3;j++)scanf("%3d",&a[i][j]);for (i=0;i<3;i++)sum=sum+a[i][i];printf("sum=%6d\n",sum);return 0;}6-4#include <>int main(){ int a[11]={1,4,6,9,13,16,19,28,40,100}; int temp1,temp2,number,end,i,j;for (i=0;i<10;i++)printf("%5d",a[i]);printf("\n");printf("insert data:"); scanf("%d",&number);end=a[9];if (number>end)a[10]=number;else{for (i=0;i<10;i++){if (a[i]>number){temp1=a[i];a[i]=number;for (j=i+1;j<11;j++) {temp2=a[j];a[j]=temp1;temp1=temp2;}break;}}}printf("Now array a:\n"); for (i=0;i<11;i++)printf("\n");return 0;}6-5#include <>#define N 5int main(){ int a[N],i,temp;printf("enter array a:\n");for (i=0;i<N;i++)scanf("%d",&a[i]);printf("array a:\n");for (i=0;i<N;i++)printf("%4d",a[i]);for (i=0;i<N/2;i++) n",number);; printf("continu or not(Y/N)");scanf(" %c",&c);if (c=='N'||c=='n')flag=0;}return 0;}6-10#include <>int main(){int i,j,upp,low,dig,spa,oth;char text[3][80];upp=low=dig=spa=oth=0;for (i=0;i<3;i++){ printf("please input line %d:\n",i+1);gets(text[i]);for (j=0;j<80 && text[i][j]!='\0';j++){if (text[i][j]>='A'&& text[i][j]<='Z')upp++;else if (text[i][j]>='a' && text[i][j]<='z') low++; else if (text[i][j]>='0' && text[i][j]<='9') dig++; else if (text[i][j]==' ')spa++;elseoth++;}}printf("\nupper case: %d\n",upp);printf("lower case: %d\n",low);printf("digit : %d\n",dig);printf("space : %d\n",spa);printf("other : %d\n",oth);return 0;}#include <>int main(){ char a[5]={'*','*','*','*','*'}; int i,j,k;char space=' ';for (i=0;i<5;i++){ printf("\n");printf(" ");for (j=1;j<=i;j++)printf("%c",space);for (k=0;k<5;k++)printf("%c",a[k]);}printf("\n");return 0;}6-12a-c#include <>int main(){ int j,n;char ch[80],tran[80];printf("input cipher code:");gets(ch);printf("\ncipher code :%s",ch);while (ch[j]!='\0'){ if ((ch[j]>='A') && (ch[j]<='Z')) tran[j]=155-ch[j];else if ((ch[j]>='a') && (ch[j]<='z')) tran[j]=219-ch[j];elsetran[j]=ch[j];j++;}n=j;printf("\noriginal text:");for (j=0;j<n;j++)putchar(tran[j]);printf("\n");return 0;}6-12b#include <>int main(){int j,n;char ch[80];printf("input cipher code:\n");gets(ch);printf("\ncipher code:%s\n",ch);while (ch[j]!='\0'){ if ((ch[j]>='A') && (ch[j]<='Z'))ch[j]=155-ch[j];else if ((ch[j]>='a') && (ch[j]<='z')) ch[j]=219-ch[j];elsech[j]=ch[j];j++;}n=j;printf("original text:");for (j=0;j<n;j++)putchar(ch[j]);printf("\n");return 0;}6-13#include <>int main(){ char s1[80],s2[40];int i=0,j=0;printf("input string1:");scanf("%s",s1);printf("input string2:");scanf("%s",s2);while (s1[i]!='\0')i++;while(s2[j]!='\0')s1[i++]=s2[j++];s1[i]='\0';printf("\nThe new string is:%s\n",s1); return 0;}6-14#include <>int main(){ int i,resu;char s1[100],s2[100];printf("input string1:");gets(s1);printf("\ninput string2:");gets(s2);i=0;while ((s1[i]==s2[i]) && (s1[i]!='\0'))i++; if (s1[i]=='\0' && s2[i]=='\0')resu=0;elseresu=s1[i]-s2[i];printf("\nresult:%d.\n",resu);return 0;}6-15#include <>#include <>int main(){ char s1[80],s2[80];int i;printf("input s2:");scanf("%s",s2);for (i=0;i<=strlen(s2);i++)s1[i]=s2[i];printf("s1:%s\n",s1);return 0;}第7章用函数实现模块化程序设计170为什么要用函数170怎样定义函数172为什么要定义函数172定义函数的方法173调用函数174函数调用的形式174函数调用时的数据传递175函数调用的过程177函数的返回值178对被调用函数的声明和函数原型179函数的嵌套调用182函数的递归调用184数组作为函数参数192数组元素作函数实参193数组名作函数参数194多维数组名作函数参数197局部变量和全局变量199局部变量199全局变量200变量的存储方式和生存期204动态存储方式与静态存储方式204局部变量的存储类别205全局变量的存储类别208存储类别小结212关于变量的声明和定义214内部函数和外部函数215内部函数215外部函数215习题2187-1-1#include <>int main(){int hcf(int,int);int lcd(int,int,int);int u,v,h,l;scanf("%d,%d",&u,&v);h=hcf(u,v);printf("",h);l=lcd(u,v,h);printf("",l);return 0;}int hcf(int u,int v){int t,r;if (v>u){t=u;u=v;v=t;}while ((r=u%v)!=0){u=v;v=r;}return(v);}int lcd(int u,int v,int h) {return(u*v/h);}7-1-2#include <>int Hcf,Lcd;int main(){void hcf(int,int); void lcd(int,int);int u,v;scanf("%d,%d",&u,&v); hcf(u,v);lcd(u,v);printf("",Hcf);printf("",Lcd); return 0;}void hcf(int u,int v) {int t,r;if (v>u){t=u;u=v;v=t;}while ((r=u%v)!=0) {u=v;v=r;}Hcf=v;}void lcd(int u,int v) {Lcd=u*v/Hcf;}7-2#include <>#include <>float x1,x2,disc,p,q;int main(){void greater_than_zero(float,float);void equal_to_zero(float,float);void smaller_than_zero(float,float);float a,b,c;printf("input a,b,c:");scanf("%f,%f,%f",&a,&b,&c);printf("equation: %*x*x+%*x+%=0\n",a,b,c); disc=b*b-4*a*c; printf("root:\n");if (disc>0){greater_than_zero(a,b);printf("x1=%f\t\tx2=%f\n",x1,x2);}else if (disc==0){equal_to_zero(a,b);printf("x1=%f\t\tx2=%f\n",x1,x2);}else{smaller_than_zero(a,b);printf("x1=%f+%fi\tx2=%f-%fi\n",p,q,p,q);}return 0;}void greater_than_zero(float a,float b) {x1=(-b+sqrt(disc))/(2*a);x2=(-b-sqrt(disc))/(2*a);}void equal_to_zero(float a,float b){x1=x2=(-b)/(2*a);}void smaller_than_zero(float a,float b) {p=-b/(2*a);q=sqrt(-disc)/(2*a);}7-3#include <>int main(){int prime(int);int n;printf("input an integer:");scanf("%d",&n);if (prime(n))printf("%d is a prime.\n",n);elseprintf("%d is not a prime.\n",n); return 0;}int prime(int n){int flag=1,i;for (i=2;i<n/2 && flag==1;i++)if (n%i==0)flag=0;return(flag);}7-4#include <>#define N 3int array[N][N];int main(){ void convert(int array[][3]); int i,j;printf("input array:\n");for (i=0;i<N;i++)for (j=0;j<N;j++)scanf("%d",&array[i][j]);printf("\noriginal array :\n"); for (i=0;i<N;i++){for (j=0;j<N;j++)printf("%5d",array[i][j]);printf("\n");}convert(array);printf("convert array:\n"); for (i=0;i<N;i++){for (j=0;j<N;j++)printf("%5d",array[i][j]); printf("\n");}return 0;}void convert(int array[][3]) {int i,j,t;for (i=0;i<N;i++)for (j=i+1;j<N;j++){t=array[i][j];array[i][j]=array[j][i]; array[j][i]=t;}}#include <>#include <>int main(){void inverse(char str[]); char str[100];printf("input string:");scanf("%s",str);inverse(str);printf("inverse string:%s\n",str);return 0;}void inverse(char str[]){char t;int i,j;for (i=0,j=strlen(str);i<(strlen(str)/2);i++,j--){t=str[i];str[i]=str[j-1];str[j-1]=t;}}7-6#include <>int main(){void concatenate(char string1[],char string2[],char string[]); char s1[100],s2[100],s[100];printf("input string1:");scanf("%s",s1);printf("input string2:");scanf("%s",s2);concatenate(s1,s2,s);printf("\nThe new string is %s\n",s);return 0;}void concatenate(char string1[],char string2[],char string[]) {int i,j; for (i=0;string1[i]!='\0';i++)string[i]=string1[i];for(j=0;string2[j]!='\0';j++)string[i+j]=string2[j];string[i+j]='\0';}7-7#include <>int main(){void cpy(char [],char []);char str[80],c[80];printf("input string:");gets(str);cpy(str,c);printf("The vowel letters are:%s\n",c);return 0;}void cpy(char s[],char c[]){ int i,j;for (i=0,j=0;s[i]!='\0';i++)if (s[i]=='a'||s[i]=='A'||s[i]=='e'||s[i]=='E'||s[i]=='i'||s[i]=='I'||s[i]=='o'||s[i]=='O'||s[i]=='u'||s[i]=='U') {c[j]=s[i];j++;}c[j]='\0';}7-8#include <>#include <>int main(){char str[80];void insert(char []);printf("input four digits:");scanf("%s",str);insert(str);return 0;本文档下载自360文档中心，更多营销,职业规划,工作简历,入党,工作报告,总结,学习资料,学习总结,PPT模板下载,范文等文档下载；转载请保留出处。
