Friend что то не френдится - C++

//Point.h
#ifndef POINT_H
#define POINT_H
 
 
class Point 
{
private:
    double x; 
    double y;
    friend ostream& operator << (ostream& os,const Point& p);
 
public:
 
 
        
        // defualt constructors and constructors 
 
    Point();
    Point(double xval, double yval);
    virtual ~Point();
 
    
 
    //  modificators
void    X (double xval); 
void    Y (double yval);
double X();
double Y(); 
 
    // other method 
    void ToString(); 
    void add(const Point& OtherPoint);
    Point Point::operator + (const Point& OtherPoint) const;
    
 
 
};
 
#endif

//main.cpp
 
#include "Point.h"
#include <iostream>
 
 
 
 
using namespace std; 
 
 
 
 
 
 
int main ()
{
 
    
 
    double x1, y1,x2 , y2;
        //;
 
    
 
cout << "input X and for first point : " <<endl; 
cout << "X :" ;
cin >> x1 ;
cout <<  endl; 
cout << "Y :" ;
cin >> y1;
 
cout << "input X and for second point : " <<endl; 
cout << "X :" ;
cin >> x2 ;
cout <<  endl; 
cout << "Y :" ;
cin >> y2;
 
 
Point spo1(0,0);
Point spo2(0,0);
 
 //x2 = 511;
 spo1.X(x1);
 spo1.Y(y1);
 spo2.X(y2);
 spo2.Y(x2);
 
 Point C (0,0); 
 
 C= spo1 + spo2;
 
 
spo1.ToString();
spo2.ToString();
C.ToString();
cout << "now will be magic "  << endl;
cout << C; 
 
cout << endl;
system ("pause");
 
}

//Point.cpp
 
#include "Point.h"
#include <iostream>
 
 
using namespace std; 
 
 
Point::Point():x(0),y(0)
    {
    };
 
Point::Point(double xval, double yval)
    {
    x = xval; 
    y = yval;
    };  
 
void Point::X(double xval)
{
    x = xval ; 
}
 
void Point::Y(double yval)
{
    y = yval;
}
 
double Point::X()
{
 
    return x; 
}
 
double Point::Y()
{
    return y; 
}
 
ostream& operator << (ostream& os, const Point& p)
{
    
    os << "[" << p.x << ", " << p.y << "]\n";
    return os;
}
 
void Point::ToString()
{
    cout << "(" << X() << "," << Y() << ")" << endl;
}
 
Point Point::operator + (const Point& OtherPoint) const
{
    return Point(x + OtherPoint.x, y + OtherPoint.y);
}

virtual ~Point(){}
//и
Point operator + (const Point& OtherPoint) const;