写错了根据优先级,==比=大,你忘记加()了,所以才不行.#include<stdio.h>
#include<stdlib.h>

void main()
{
  FILE *fp;
  char ch;

  if( (fp=fopen("fa.dat","r"))==NULL)
  {printf("Can't open this file!\\n");exit(0);}

  ch=getchar();
  while(ch!='@')
  {fputc(ch,fp);ch=getchar();}

  fclose(fp);
}