有关引用中函数返回多个值的问题???????????????????????????

#include<iostream.h>

int Factor(int, int&, int&);

int main()
{
    int number,squared,cubed,error;
    cout<<"Enter a number(0 ~ 20):";
    cin>>number;

    error=Factor(number,squared,cubed);

    if(error)
    cout<<"Error encountered!\n";
    else
    {
        cout<<"number:"<<number<<endl;
        cout<<"squared:"<<squared<<endl;
        cout<<"cubed:"<<cubed<<endl;
    }
}

int Factor(int n,int& rSquared,int rCubed)
{
    if(n>20||n<0)
        return 1;
    rSquared=n*n;
    rCubed=n*n*n;
    return 0;
}
VC6.0提示：Linking...
ppp192.obj : error LNK2001: unresolved external symbol "int __cdecl Factor(int,int &,int &)" (?Factor@@YAHHAAH0@Z)
Debug/pp192.exe : fatal error LNK1120: 1 unresolved externals
执行 link.exe 时出错.

pp192.exe - 1 error(s), 0 warning(s)
求大神们分析，谢谢？？？？？？？？？？？？？？？？？？？？？