#include<stdio.h>
#include<stdlib.h>
int main()
{FILE *fp;
char ch,filename[10];
printf("请输入所用的文件名:");
scanf("%s",filename);
if((fp=fopen("filename","w"))==NULL)
{printf("无法打开此文件\n");
exit(0);}
ch=getchar();
while(ch!='#')
{fputc(ch,fp);
putchar(ch);
ch=getchar();}
fclose(fp);
putchar(10);
return 0;
}