C语言改错题以及参考答案

改错参考答案：(3)将字符串yy在屏幕上输出#include<stdio.h>void main(){/*********Found************/ char yy[100] = "ok??\n";/*********Found************/f0r (; *yy; yy++){putchar(*yy);}}#include<stdio.h>void main(){/*********Found************/ char*yy="ok??\n";/*********Found************/for (; *yy; yy++){putchar(*yy);}}(4)计算半径为2+3的圆的面积#include<stdio.h>#define PI3."14/*********Found************/#define S(r) PI*r*rvoid main(){/*********Found************/ int mianJi;mianJi = S(2+3);printf("mian ji=%5."2f\n", mianJi);}#include<stdio.h>#define PI3."14/*********Found************/#define S(r) PI*(r)*(r)void main(){/*********Found************/1floatmianJi; mianJi = S(2+3);printf("mian ji=%5."2f\n", mianJi);}(8)打开文件d:\te.c用于读并判断打开是否成功#include<stdio.h>void main(){FILE *fp;/*********Found************/char fileName[] = "d:\te.c";/*********Found************/fp = fopen(fileName, "w");/*********Found************/if (fp == EOF){puts("File Open Error!");exit(1);}putchar(fgetc(fp));fclose(fp);}#include<stdio.h>void main(){FILE *fp;/*********Found************/char fileName[] = "d:\\te.c";/*********Found************/fp = fopen(fileName, "r");/*********Found************/if (fp ==NULL){puts("File Open Error!");exit(1);}putchar(fgetc(fp));fclose(fp);}(9)申请100个字节的内存空间，显示其首地址，然后释放申请到的内存空间#include<stdio.h>#include<alloc.h>void main(){/*********Found************/char p[100];2/*********Found************/if (p = (char *)malloc(100) == NULL){printf("malloc memory fail!\n");return ;}printf("%p\n", p);/*********Found************/fclose(p);}#include<stdio.h>#include<alloc.h>void main(){/*********Found************/ char*p;/*********Found************/if ((p = (char *)malloc(100))== NULL){printf("malloc memory fail!\n"); exit(1);}printf("%p\n", p);/*********Found************/free(p);}(10)将字符串p显示在屏幕上#include<stdio.h>/*********Found************/#define BEGIN/*********Found************/#define ENDvoid main(){char *p = "";const int i = 0;for (printf("\n"); p[i]; )BEGINputchar(p[i]);i++;END}#include<stdio.h>/*********Found************/#define BEGIN{/*********Found************/#define END}3void main(){char *p = "";const int i = 0;for (printf("\n"); p[i]; )BEGINputchar(p[i]);/*********Found************/p++;END}(14)调用函数swap，将a和b的值交换，最后在屏幕上显示交换后的a,b之值#include<stdio.h>/*********Found************/void swap(int x, int y){int tmp;/*********Found************/______*x = *y;/*********Found************/y = x;}void main(){int a = 3, b = 4;swap(a, b);printf("a=%d b=%d\n", a, b);}#include<stdio.h>/*********Found************/void swap(int*x, int*y){int tmp;/*********Found************/tmp = *x;*x = *y;/*********Found************/*y = tmp;}void main(){int a = 3, b = 4;/*********Found************/swap(&a,&b);printf("a=%d b=%d\n", a, b);}4(15)调用函数swap，将a和b的值交换，最后在屏幕上显示交换后的a,b之值#include<stdio.h>void swap(int *x, int *y){int *tmp, xy;/*********Found************/*tmp = x;*x = *y;/*********Found************/y = *tmp;}void main(){int a = 3, b = 4;/*********Found************/swap(*a, *b);/*********Found************/printf("a=%d b=%d\n", &a, &b);}#include<stdio.h>void swap(int *x, int *y){int *tmp, xy;/*********Found************/xy=*x;*x = *y;/*********Found************/*y =xy;}void main(){int a = 3, b = 4;/*********Found************/swap(&a,&b);/*********Found************/printf("a=%d b=%d\n",a,b);}(16)worker的信息使用结构体存储，从键盘读入其各项信息并显示#include<stdio.h>void main(){struct WKER{long ID;long int num;char name[20];5char sex;/*********Found************/} ;worker.ID = 1L;/*********Found************/scanf("%d %s %s", &worker.num, , &worker.sex);/*********Found************/printf("worker's info:num=%d name=%s sex=%s\n",worker.num, , worker.sex);}#include<stdio.h>void main(){struct WKER{long ID;long int num;char name[20];char sex;/*********Found************/}worker;worker.ID = 1L;/*********Found************/scanf("%ld %s %c", &worker.num, ,&worker.sex);/*********Found************/printf("worker's info:num=%ld name=%s sex=%c\n",worker.num, , worker.sex);}(17)函数userLogin的功能主要是统计并返回登录的用户数，用户名最长30字节#include <stdio.h>long userLogin(char *userName){/*********Found************/long userCount = 0;userCount++;/*********Found************/return ;}void main( ){/*********Found************/char *userName;int i;while(1){printf("userName:");scanf("%s", userName);i = userLogin(userName);6}}#include <stdio.h>long userLogin(char *userName){/*********Found************/ staticlong userCount = 0;userCount++;/*********Found************/returnuserCount;}void main( ){/*********Found************/ charuserName[31];int i;while(1){printf("userName:");scanf("%s", userName);i = userLogin(userName);}}(19)将inBuf中字符串拆分成一个个的单词/*单词之间的分隔符由串divChar，程序中定义为“;?!,.>/\”。