向文件中写入字符,当输入#时结束

#include <stdio.h>

#include <stdlib.h>

void main(){

FILE *fp;

char ch;

if((fp=fopen("E:\\123.txt","w"))==NULL)

{

printf("can't open file\n");

exit(0);

}

ch=getchar();

while(ch !='#'){

fputc(ch,fp);

ch=getchar();

}

fclose(fp);

}

向文件中写入字符当输入#时结束