运算符重载

总是提示我找不到标识符，未声明的标识符，

新建了一个Complex类
这是Complex.h

#pragma once
#include<iostream>
using namespace std;

class Complex
{
public:
    Complex(){real=0,imag=0;}
    Complex(double r,double i)
    {
        real=r,imag=i;
    }
    friend Complex operator+(Complex &c1,Complex &c2);
    friend Complex operator-(Complex &c1,Complex &c2);
    friend void print(Complex &c);
private:
    double real,imag;
    ~Complex(void);
};

这是Complex.cpp

#include "StdAfx.h"
#include "Complex.h"
#include <iostream>
using namespace std;

Complex::~Complex(void)
{
}
Complex operator+(Complex &c1,Complex &c2)
{
    return Complex(c1.real+c2.real,c1.imag+c2.imag);
}

Complex operator-(Complex &c1,Complex &c2)
{
    return Complex(c1.real-c2.real,c1.imag-c2.imag);
}
void print(Complex &c)
{
    if(c.imag<0)
        cout<<c.real<<c.imag<<'i';
    else
        cout<<c.real<<'+'<<c.imag<<'i';
}

#include "stdafx.h"
#include<iostream>
using namespace std;


int _tmain(int argc, _TCHAR* argv[])
{
    Complex c1(2.0,3.0),c2(4.0,-1.0),c3;
    c3=c1+c2;
    cout<<"/nc1+c2=";
    print(c3);
    c3=c1-c2;
    cout<<"/nc1-c2=";
    print(c3);
    cout<<endl;
    return 0;
}

求各位大佬帮帮忙，看看哪里错了，求轻喷