FAQ: Header files, include statements

[Stoned_Coder]

this is how you should split a class over .h and .cpp files and then be able to use in another cpp file...

Point.h

#include<iosfwd>

class Point
{
   public:
     Point();
     Point(int,int);
     ~Point();
     int GetX()const;
     int GetY()const;
     void SetXY(int,int);
     friend std::ostream& operator << (std::ostream&,const Point&);

   private:
     int X;
     int Y;
};

Point.cpp

#include "Point.h"
#include<iostream>

Point::Point() : X(0),Y(0) {}
Point::Point(int x,int y) : X(x),Y(y) {}
Point::~Point() {}
int Point::GetX()const { return X;}
int Point::GetY()const {return Y;}
void Point::SetXY(int x,int y) { X=x; Y=y;}
std::ostream& operator << (std::ostream& os,const Point& p)
{
     os<<"( "<<p.X<<","<<p.Y<<" )";
     return os;
}

Main.cpp

#include "Point.h"
#include <iostream>

int main()
{
    Point p(10,10);
    std::cout <<p<<std::endl;
    p.SetXY(20,20);
    std::cout<<p<<std::endl;
    return 0;
}

Not windows specific but will give you the idea.