#include <stdio.h>
#include <stdlib.h>

int main()
{
    char ch;
    FILE *fp=fopen("D:\\test.txt","w");
    if(fp!=NULL)
      {
        printf("请输入一串字符: ");
        ch=getchar();
        while(ch!='#')
        {
            fputc(ch,fp);
            ch=getchar();

        }
      fclose(fp);
      }
      else
        printf("error!\n");
      return 0;

}