untitled2.m

从键盘输入一个字符串

#include "stdio.h" 
main() 
{ 
FILE *fp; 
char str[100],filename[10]; 
int i=0; 
if((fp=fopen("test","w"))==NULL) 
{ 
printf("cannot open the file\n"); 
exit(0); 
} 
printf("please input a string:\n"); 
gets(str); 
while(str[i]!='!') 
{ 
if(str[i]>='a'&&str[i]<='z') 
str[i]=str[i]-32; 
fputc(str[i],fp); 
i++; 
} 
fclose(fp); 
fp=fopen("test","r"); 
fgets(str,strlen(str)+1,fp); 
printf("%s\n",str); 
fclose(fp); 
}