改错参考答案：

(3)将字符串yy在屏幕上输出 #include void main() {

/*********Found************/ char yy[100] = \

/*********Found************/ f0r (; *yy; yy++) {

putchar(*yy); } }

#include void main() {

/*********Found************/ char *yy=\

/*********Found************/ for (; *yy; yy++) {

putchar(*yy); } }

(4)计算半径为2+3的圆的面积 #include #define PI 3.14

/*********Found************/ #define S(r) PI*r*r void main() {

/*********Found************/ int mianJi;

mianJi = S(2+3);

printf(\}

#include #define PI 3.14

/*********Found************/ #define S(r) PI*(r)*(r) void main() {

/*********Found************/ float mianJi; mianJi = S(2+3);

printf(\}

(8)打开文件d:\\te.c用于读并判断打开是否成功 #include void main() {

FILE *fp;

/*********Found************/ char fileName[] = \

/*********Found************/ fp = fopen(fileName, \

/*********Found************/ if (fp == EOF) {

puts(\ exit(1); }

putchar(fgetc(fp)); fclose(fp); }

#include void main() {

FILE *fp;

/*********Found************/ char fileName[] = \

/*********Found************/ fp = fopen(fileName, \

/*********Found************/ if (fp == NULL) {

puts(\ 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 #include void main()

{

/*********Found************/ char p[100];

/*********Found************/ if (p = (char *)malloc(100) == NULL) {

printf(\ return ; }

printf(\

/*********Found************/ fclose(p); }

#include #include void main() {

/*********Found************/ char *p;

/*********Found************/ if ((p = (char *)malloc(100)) == NULL) {

printf(\ exit(1); }

printf(\

/*********Found************/ free(p); }

(10)将字符串p显示在屏幕上 #include

/*********Found************/ #define BEGIN

/*********Found************/ #define END void main() {

char *p = \ const int i = 0;

for (printf(\ BEGIN

putchar(p[i]);

/*********Found************/ i++;