#include "stdio.h"
main()
{char ch;
 FILE *p;
 if((p=fopen("D:\\file_a.dat","w"))==NULL)
 {printf("can not open this the file");
  exit(0);
 }
 ch=getchar();
 while(ch!='@')
 { putc(ch,p);
   ch=getchar();
 }
 fclose(p);
if((p=fopen("D:\\file_a.dat","r"))==NULL)
 {printf("can not open this the file");
  exit(0);}
ch=getc(p);
while(ch!=EOF)
{putchar(ch);
 ch=getchar(p);
}
}
这个程序始终编译不过，但我查不出错误。是不是在D上创建文本文件错了？望热心的人帮助指点迷惑！

原来如此啊！谢啦

我把ch=getchar(p);改成了ch=getc(p); 程序如下，但还是通过不了啊！在VC++ 6。0下运行，错误提示为
C:\Documents and Settings\wan\3.cpp(7) : error C2065: 'exit' : undeclared identifier
C:\Documents and Settings\wan\3.cpp(23) : warning C4508: 'main' : function should return a value; 'void' return type assumed
执行 cl.exe 时出错.



程序
#include "stdio.h"
main()
{char ch;
FILE *p;
if((p=fopen("D:\\file_a.dat","w"))==NULL)
{printf("can not open this the file");
  exit(0);
}
ch=getchar();
while(ch!='@')
{ putc(ch,p);
   ch=getchar();
}
fclose(p);
if((p=fopen("D:\\file_a.dat","r"))==NULL)
{printf("can not open this the file");
  exit(0);}
ch=getc(p);
while(ch!=EOF)
{putchar(ch);
 ch=getc(p);
}
}