程序编译问题！
我写了两个cpp文件：

data10_01.cpp

#include <string>
using std::string;

int count;
float phi=1.618f;
extern const double pi=3.14159265;
extern const string days[]={ "Sunday ", "Monday ", "Tuesday ", "Wednesday ", "Thursday ", "Friday ", "Saturday "};

prog10_01.cpp

#include <iostream>
#include <string>
#include <iomanip>
using std::cout;
using std::endl;
using std::string;

extern float phi;
extern const double pi;
extern const string days[];
extern int count;

int main()
{
cout < <std::setprecision(3) < <std::fixed;
cout < <endl
< < "To 3 decimal places... " < <endl;
cout < < "...a circle with a diameter of phi has an area of "
< <pi*phi*phi/4
< <endl;
cout < < "...phi squared is " < <phi*phi < <endl;
cout < < "...in fact,phi+1 is also " < <phi+1 < <endl;
cout < < "Value of count is " < <count < <endl;
count+=3;
cout < < "Today is " < <days[count] < <endl;
return 0;
}

我将data10_01.cpp编译成obj文件，却提示：error LNK2001:unresolved external symbol _main
　　　　　　　　　　　　　　　　　:fatal error LNK1120: 1 unresolved externals
编译prog10_01.cpp文件时，提示更多。

请问各位高手，如何编译这两个cpp文件？

[解决办法]
你要想编译成中间文件.obj，要用参数的！你看一下TC的帮助吧。默认情况下TC会把.cpp文件编译成.exe文件，你得data10_01.cpp没有main函数，所以报错！
你的第二个文件报错更多，是因为你用到了data10_01.cpp文件中定义的变量，但是你有没有将data10_01.cpp包含进去。
总而言之，是可以将各个.cpp文件先编译，再连接；前提是要各个.cpp文件都能独立编译通过。