c++问题，编译出错

// wu_6_001.cpp : Defines the entry point for the console application.
//

//#include "stdafx.h"

#include <iostream>
using namespace std;

bool isnumber(char);

int main()
{
char c;
while(cin>>c && c!='\n')
{
if(isnumber(c))
cout<<"you entered a digit.\n";
else
cout<<"you entered a non-digit.\n";
}
// printf("Hello World!\n");
return 0;
}

bool isnumber(char ch)
{
return ch>='0'&&ch<='9'?1:0;
}
编译显示为：
Compiling...
wu_6_001.cpp
f:\吴职钦\wu_6_001\wu_6_001.cpp(30) : fatal error C1010: unexpected end of file while looking for precompiled header directive
执行 cl.exe 时出错.

wu_6_001.obj - 1 error(s), 0 warning(s)

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