《C语言程序设计》实验源程序代码目录实验二顺序结构程序设计(上) (2)实验三顺序结构程序设计(下) (2)实验四选择结构程序设计(上) (4)实验五选择结构程序设计(下) (4)实验六循环结构程序设计(上) (5)实验七循环结构程序设计(下) (6)实验八函数 (8)实验九数组(上) (9)实验十数组(下) (11)实验十一指针的应用 (12)实验十二结构体 (14)实验十三文件操作 (17)实验二顺序结构程序设计(上)//1-1void main(){ int a=1;printf("1:%d\n", sizeof(a));printf("2:%d\n", sizeof(float));printf("3:%d\n", sizeof(2.0*10));printf("4: %d\n", sizeof("Liu Dehua"));}//1-2-------------------------------------------------------- #include <stdio.h>void main(){ int a1=65,a2,a3;char ch='A'+1;printf("1:\101 \x42 C\n");printf("2:I say:\"How are you?\"\n");printf("3:\t\\\\Display Hello! I am Tom\b!\n");printf("4:65/10=%d,65%%10=%d\n",65/10, 65%10);printf("5:a1=%d,a1=\'%c\'\n",a1,a1);printf("6:ch=%c,ch=%d\n",ch,ch);a2=2,a3=(a1=3,a2+=a1,a1*a2);printf("7:a1=%d,a2=%d,a3=%d\n",a1,a2,a3);a3=a2=a1=2;printf("8:%d,%d,%d\n",(a1,a2+1),a3+2,a1+a2+a3);}//2------------------------------------------------------------#include <stdio.h>void main(){ float c,f;printf("请输入一个华氏温度：\n");scanf("%f"，f);c==(5/9)*(f-32);printf("摄氏温度为：%5.2f\n"c);}实验三顺序结构程序设计(下)//1-1#include "stdio.h"void main(){ char ch=65;int a=1234;long g=12345678;float f=123.456789f;double d=9.876543E2;printf("1：%d,%c,%5d,%3c\n",ch,ch,ch,ch);printf("2：%8d,%-8d,%o,%x\n",a,a,a,a);printf("3：%10.3f,%f,%e\n",f,f,f);printf("4：%-10.2lf,%lf,%le\n",d,d,d);printf("5：%10s,%10.3s\n","Hello,world!","Hello,world!");}//1-2#include <stdio.h>main(){ int a,b,c;a=getchar();b=getchar();c=getchar();printf("a=%d b=%d c=%d\n",a,b,c);printf("a=%c b=%c c=%c\n",a,b,c);}//1-3---------------------------------------------------------------------------------------#include "stdio.h"void main(){int a=10,b;int *p; // p为指向整型变量的指针变量 printf("1：a的值=%d, a的内存地址值=%d\n",a, &a); //&a:获取变量a的内存地址值p=&a; //将变量a的内存地址值赋给指针变量p printf("2：p的值=%d, p的内存地址值=%d,p所指向的内存单元的值=%d\n",p,&p,*p);scanf("%d,%d" ,p,&b); //运行时输入100,200【enter】printf("3：a的值=%d,b的值=%d,p所指向的内存单元的值=%d\n",a,b,*p);}//3-3-----------------------------------------------------------#include <stdio.h>#include <math.h> //包含数学函数库void main(){ double a,b,c,p,s;printf("输入三角形三边a,b,c: ");scanf("%lf,%lf,%lf",&a,&b,&c);if(a+b>c && b+c>a && a+c>b) //判断该三边的值是否能构成一个三角形{ p= ;s=sqrt( ); //sqrt():求平方根函数printf("三角形面积=%lf\n",s);}elseprintf("三边(a=%lf,b=%lf,c=%lf)不能构成三角形! ",a,b,c);}实验四选择结构程序设计(上)//2#include <stdio.h>void main(){ char ch,c1,c2;printf("Enter a character:");ch=getchar();if((ch>='A')||(ch<='Z')&& (ch>='a')||(ch<='z'))c1=ch-1;c2=ch+1;if(ch='A'&&ch=’a’) c1=ch+25;else if(ch='Z'&&ch=’z’) c2=ch-25;putchar(c1);putchar(ch);putchar(c2);putchar('\n');}实验五选择结构程序设计(下)//1#include "stdio.h"void main(){ char m;printf(“input the month number:\n”);scanf (“%c”,&m);switch (m){case 1 : printf ("Jan");case 2 : printf ("Feb");case 3 : printf ("Mar");case 4 : printf ("Apr");else : printf ("error");}}//2----------------------------------------------------------------------- #include <stdio.h>void main(){ int a,b,d;char ch;printf("Please input a expression:");scanf("%d%c%d", );switch(ch){ case '+': printf("%d+%d=%d\n",a,b,a+b);break;case '-': printf("%d-%d=%d\n",a,b,a-b);break;case '*': printf("%d*%d=%d\n",a,b,a*b);break;case '/': if( )printf("Divisor is zero\n");elseprintf("%d/%d=%lf\n",a,b, a/b); /*强制类型转换*/;default: printf("Input Operator error!\n");}｝实验六循环结构程序设计(上)//1-1#include <stdio.h>void main(){ int i=1,sum=0;while(i<100)sum=sum+i;i++;printf("Sum = %d\n",sum);}//1-2--------------------------------------------------------------------------------#include <stdio.h>void main(){ char x;x='Z';while(x!='A'){ printf("%3d",x);if(('Z'-x)%5= =0) printf("\n");x++;}}//2-1-----------------------------------------------------------------#include<stdio.h>void main(){ int n = 21,i;while ( ){ printf( "You take ... ");scanf("%d",&i);if ( )printf( "Don't try to cheat me, take 1, 2, 3, or 4, please! \n");else{ printf( "I take %d\n", 5-i);n = ; //剩下的火柴棍根数}}printf( " Now take the last one, please! \n Haha^-^, you loss!) \n "); }//2-2-------------------------------------------------------------------- #include <stdio.h>void main(){ int day,x1,x2;day=0;x1=1020;while( ){ x2= ;x1=x2;day++;}printf("day=%d\n",day);}//2-3---------------------------------------------------------------------- #include<stdio.h>void main(){ long x,m,y=0;int gw,count=0;printf("input x=");scanf("%ld",&x);;do{ gw=m%10;y= ;;count++;}while( );printf("x=%ld, count=%d, recycle=%ld\n",x,count,y);}}实验七循环结构程序设计(下)//1-1#include<stdio.h>void main(){ long sum(int);long s=0;int k;for(k=1;k<20;k+=2)s=s+sum(k);printf("s=%ld\n",s);}long sum(int x) //求1+2+...+x{ long result=0;int i;for(i=1;i<=x;i++)result+=i;return result;}//1-2------------------------------------------------------------------------#include<stdio.h>void main(){long s=0,result=0;int k,i;for(k=1;k<20;k+=2){for(i=1;i<=k;i++)result+=i;s=s+result;}printf("s=%ld\n",s);}//2-1--------------------------------------------------------------------------#include<stdio.h>void main(){ float score,sum=0,average;int persons=0;while(1){ scanf("%f",&score);if(score<0)continue;else if(score>100)break;else{ sum+=score;persons++;}}average=(float)(sum/persons);printf("人数=%d,平均分=%f\n",persons,average);}//2-2------------------------------------------------------#include <stdio.h>void main(){ int i,j;for (i=0;i<4;i++){ for (j=0;j<=20;j++)printf("\n");for (j=0;j<2*i+1;j++)printf("*");}}//2-3-----------------------------------------------------------#include "stdio.h"void main(){ int a,k,s=0;for (k=2; k<1000; k++){for (a=1; a<=k/2; a++)if(k%a==0) s+=a;if (s==k) //k是完数printf("%d is OK!\n",k);}}实验八函数//1-1#include "math.h"#include "stdio.h"void main(){ float a,b,c;printf("请输入三角形的边长值：\n");scanf("%f%f%f",a,b,c);if(a+b>c&&a+c>b&&b+c>a)printf("Area=%f\n",area(a,b,c));}area(float a,float b,float c){ float s,area_s;s=(a+b+c)/2.0;area_s=sqrt(s*(s-a)*(s-b)*(s-c));return(area_s);}//1-2--------------------------------------------------------------------------#include<stdio.h>int fun(int n){ int jc=1,i;for(i=2;i<=n;i++) jc*=n;return jc;}void main(){ int n;long sum=0;for(n=1;n<11;n++);if(n%3==0||n%5==0)sum+=fun(int n);printf("sum=%ld\n",sum);}//1-3---------------------------------------------------#include<stdio.h>swap(int *p1,int *p2){ int *p;p=p1;p1=p2;p2=p;}void main(){ int a,b;scanf("%d%d",&a,&b);printf("a=%d\tb=%d\n",a,b);swap(&a,&b);printf("a=%d\tb=%d\n",a,b);}//2-1-----------------------------------------------------------------#include<stdio.h>void printline(int n) //{ int i,k;for(i=1;i<=30-n;i++) printf("%c",' ');for(i=1;i<= ;i++) printf( );printf("\n");}void main(){ int i;for(i=1;i<=5;i++) ;for(i=4;i>=1;i--) ;}//2-2-------------------------------------------------------------------------------------------------------#include " stdio.h "int isprime(int m) //判别m是否为质数{ int i ;for(i=2;m%i!=0;i++); //注意：循环体是空语句return ( );}void main(){ int n,x,a,b;scanf("%d",&x);for(n=6;n<=x ;n+=2)for(a=3;a<=n/2;a+=2)if( ) //若a是素数{ b=n-a;if( ) //若b是素数{ printf(“%d=%d+%d”,n,a,b);; //退出a循环，判别下一个n的组合}}}实验九数组(上)//1-1#include<stdio.h>#define N 9;void main(){ int i,sum=0,a[N],max,min;for(i=0;i<N;i++)scanf("%d",a[i]);sum=max=min=a[0];for(i=0;i<N;i++){ sum+=a[i];if(a[i]>max)max=a[i];else if(a[i]<min)min=a[i];}for(i=0;i<N;i++){ printf("%8d",a[i]);if(i%3==2) printf("\n");}printf("max=%d min=%d average=%lf\n",max,min,sum*1.0/N);}//1-2--------------------------------------------------------------------------------------#include <stdio.h>void main(void){ const int n=3;int i,j,sum;int a[][n]={1,2,3,4,5,6,7,8,9};for(i=0;i<=n;i++)for(j=0;j<=n;j++)if(i==j||i+j==n)sum+=a[i][j];printf("sum=%d\n",sum);}//2-1--------------------------------------------------------------#include <stdio.h>#include <math.h>int Is_sushu(int x){ int i,re;re=x>1?1:0;for(i=2;i<=sqrt(x);i++)if( ){ re=0; break;}return(re);}void main(void){ const int n=10;int ss[n],hs[n],k,m,p1,p2;p1=p2=-1;for(k=1;k<=n;k++){ printf("NO %d:",k);scanf("%d",&m);if( ) //若m为素数{ p1++;ss[p1]=m;}else{ ;hs[p2]=m;}}for(k=0;k<=p1;k++) //输出素数数列printf("%4d ",ss[k]);printf(" count=%d\n",p1);for(k=0;k<=p2;k++) //输出合数数列printf("%4d ",hs[k]);printf("count=%d\n", );}//2-2-------------------------------------------------------#include<stdio.h>#include<stdlib.h>void main( ){ int a[10],i,j,t;for(i=0;i<10;i++){ a[i]= ; //生成随机整数printf("%d ",a[i]);}for(i=0;i<9;i++)for(j=0;j< ; j++)if(a[j]>a[j+1]){ t=a[j];a[j]=a[j+1]; ;}printf("\nthe sorted numbers: \n");for(i=0;i<10;i++)printf("%5d ",a[i]);}实验十数组(下)//1-1#include<stdio.h>void main( ){char a[]="wel",b[]="come";int i,n=0;while(!a[n]) n++;for(i=0;b[i]!='\0';i++)a[n+i]=b[i];printf("%s\n",a);}//1-2---------------------------------------------------------------#include<stdio.h>#define N 6int sum(int x,int n){ int i=0,s=0;while(i<=n)if(x[i]>0){s=s+x[i]; i++;}return s;}void main(){ int i=0,s,a[N];do{ printf("NO%d: ",i+1);scanf("%d",&a[i]);if((-100<=a[i])&&(a[i]<=100))i++;elseprintf("wrong! input again...\n");}while(i<N);s=sum(a[N],N);printf(" sum=%d\n",s);}//2-1------------------------------------------------------------#include "stdio.h"main(){ c har str[40];int alphabet=0,digit=0,space=0,other=0,i=0;printf("请输入一串字符:\n");gets(str);while( ){ if(('A'<=str[i])&&(str[i]<='Z')||('a'<=str[i])&&(str[i]<='z')) ++alphabet;else if(str[i]==' ') ++space;else if((str[i]<='9')&&(str[i]>='0')) ++digit;else ++other;i++;}printf("其中有%d个字母，%d个空格，%d个数字，%d个其他字符!\n",alphabet,space, digit,other);}//2-2-------------------------------------------------------------------------------------------------------#define N 50#define M 20#include <stdio.h>void main(){ char a[N][10]; //学号float score[N][M],max_score; //成绩int n,m,i,j,studid;/*输入学生的学号和各门课程的成绩*/printf("学生数n,课程数m:");scanf("%d,%d",&n,&m);for(i=1;i<=n;i++){ printf("输入第%d位学生的学号:",i);scanf("%s", );printf("按课程顺序输入成绩:");for(j=1;j<=m;j++)scanf("%f", );}/*找出每门课程最高的学生学号、课程代号和成绩并输出*/for(j=1;j<=m;j++){ studid=1;max_score=score[1][j];for(i=1;i<=n;i++)if(score[i][j]> max_score){ max_score=score[i][j];studid=i;}printf("第%d门课程最高分的学生学号是：%s,成绩为：%6.2f\n",j,a[studid],max_score);}}实验十一指针的应用//1-1#include <stdio.h>void main(){ int *p,i,a[5];p=a[1];printf("please enter 5 numbers:");for(i=0;i<5;i++)scanf("%d",p++);for(i=0;i<5;i++,p++)printf("%d ",*p);printf("\n");}//1-2-----------------------------------------------------------------------------------------#include<stdio.h>int digits(char *s){ int c=0;while(s){ if(*s >=0&&*s <=9)c++;s++;}return c;}void main(){ char s[80];printf("请输入一行字符\n");gets(s);printf("个数=%d\n",digits(s));}//2-1-------------------------------------------------------------#include<stdio.h>int findmax(int *s,int t ){ int i,k=0;for(i=0; ;i++)if( ) k=i;return ;}void main(){ int j,a[10]={12,23,34,45,56,67,78,89,11,22},k=0,*add;for(j=0;j<10;j++)printf("%4d%10xh\n",a[j],&a[j]);k=findmax(a,10);add=&a[k];printf("\n数组下标=%d，数组元素值=%d,元素地址=%xh\n",k,a[k], add);}//2-2------------------------------------------------------------------ #include <string.h>#include <stdio.h>#define N 81void fun(char *s){ int i=0,t,n= ;for(;s+i<s+n-1-i;i++){ t=*(s+i);*(s+i)= ;*(s+n-1-i)=t; }}void main(){ char a[N];gets(a);printf("The original string is:");puts(a);fun(a);printf("\nThe string after modified:"); puts(a);}//2-3-----------------------------------------------------------#include<stdio.h>#include "string.h"#define N 5void sort(char (*p)[20]) //利用行指针对N个字符串进行排序{ int i,j; char k[20];for (i=0; i<N-1; i++)for (j=i+1; j<N; j++)if (strcmp( ,*(p+j))>0) //*(p+i)表示第i个串{ strcpy(k,*(p+i));strcpy(*(p+i), );strcpy(*(p+j),k);}}void main(){ char ch[N][20]; int i,j;for (i=0; i<N; i++) gets(ch[i]); //输入N个串sort(ch); //利用行指针排序for(i=0; i<N; i++) puts(ch[i]); //输出}实验十二结构体//1-1#include<stdio.h>struct stud{ char name[20];int age;} ;fun(struct stud person[],int n){ int min,i;min=0;for(i=0;i<n;i++)if(person[i] <person[min] ) min=i;return (person );}void main(){ struct stud a[]={{"Zhao",21},{"Qian",20},{"Sun",19},{"LI",22}};int n=4;struct stud minpers;minpers=fun(a,n);printf("%s 是年龄小者,年龄是：%d\n",,minpers.age);}//2-1-----------------------------------------------------------#include<stdio.h>#include<string.h>struct bdata{ int id;char bname[20];float price;} ;int findbook(struct bdata st[],int n,char s[]){ int i;for(i=0;i<n;i++)if(________) return i;__________________;}void main(){ struct bdata book[100];char st[20];int index;printf("请输入要查找书名：";gets(st);index=findbook(_______________);if (index = = -1) printf("%s的书未找到\n",st);else printf("%s的书在%d位置\n",st,index);}//2-2------------------------------------------------------------------------------------------#include<stdio.h>#define M 3#define N 4struct stud{ int no;char name[16];float mark[M];float aver;};void input(struct stud st[]) //输入学生记录{ int i,j;float sum;for(i=0;i<N;i++){ printf("\n输入第%d个学生的学号,姓名:");scanf("%d,%s", );printf("\n输入第%d个学生的3门课程成绩:");for(j=0;j<M;j++)scanf("%f", );}}void output(struct stud st[]) //输出学生记录{ int i,j;printf("\n学号姓名课程1 课程2 课程3 平均分\n");for(i=0;i<N;i++){ printf("%5d %8s",st[i].no,st[i].name);for(j=0;j<M;j++)printf("%5.1f",st[i].mark[j]);printf("%5.2f",st[i].aver);}}void average(struct stud st[]) //求每个学生的平均成绩{ int i,j;float sum;for(i=0;i<N;i++){ sum= ;for(j=0;j<M;j++)sum= ;=sum/M;}}void main(){ struct stud preson[N];input( );average(preson);output(person);}//2-3---------------------------------------------------------------------------------------------------struct oneday{ int day,month,year; };void main(){ struct oneday day1;int alldays(struct oneday);printf("Enter year,month,day:");scanf("%d-%d-%d", );printf("%d\n",alldays(day1));}int runnian(int year){ if (year%400==0) return(1);if (year%4==0 && year%100!=0) return(1);return(0);}int alldays(struct oneday one){ int day[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};int i,t=0;if (runnian(one.year)) day[2]=29;for (i=1; i< ;i++)t+=day[i];t=t+one.day;return(t);}实验十三文件操作//1-1#include <stdio.h>#include<string.h>void main(){ FILE *fp1;char ch[80];int i,j;fp1=fopen("C:\\data1.dat","b");for(i=1;i<=4;i++){ gets(ch);j=0;while(ch[j]!='\0'){ fputc(fp1, ch[j]); j++; }fputc(fp1,'\n');}fclose(fp1);}//1-2----------------------------------------------------------------------------------------#include <stdlib.h>#include <stdio.h>#include <time.h>void main ( ){ int x[10],i,k;FILE *fp2;srand( (unsigned)time( NULL ) );for (i=0;i<10;i++)x[i]=rand();fp2=fopen ("C:\\data2.dat","wb");if(fp2==NULL){ printf("Open error \n");exit(0);}for (int k=0 ; k<10 ; k++ )fwrite(x[k],sizeof(int), fp2);fclose (fp2) ;}//2-1----------------------------------------------------------------#include<stdio.h>#include<stdlib.h>void main(){ FILE *fp;int i=0;char *str[]={"visual C++","visual Basic","visual java","visual foxpro"};if((fp=fopen("C:\\data3.txt", ))==NULL){ printf("%s不能打开!\n","data3.txt");exit(1);}while(i<4){fprintf( );;}fclose(fp);//2-2-------------------------------------------------------------------------------------------------------------------#include<stdio.h>#include<stdlib.h>void main(){ char c;FILE *fp3; long num=0;if((fp3=fopen("c:\\ data3.txt", ))==NULL){ printf("Open error \n");exit(0); }c=fgetc(fp3);while ( ){;c=fgetc(fp3);}printf("\nnum=%ld\n", num);;}（注：可编辑下载，若有不当之处，请指正，谢谢!）。
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