13-1.cpp

清华大学谭浩强C程序设计（第3版）程序源代码

#include <stdlib.h>
#include <stdio.h>
  void   main(void)
    {FILE *fp;
       char ch,filename[10];
       scanf("%s",filename);
       if((fp=fopen(filename,"w"))==NULL)
 {
printf("cannot open file\n");
    exit(0);
}

      ch=getchar( );
 ch=getchar( );
     while(ch!='#')
	{
	  fputc(ch,fp);putchar(ch);
	  ch=getchar();
	 }
     fclose(fp);
    }