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c++ - Make headers???

Hello to Everybody,

I have the class declaration 'BOX.h', the class implementation 'BOX.cpp' 
and the main routine 'BOXEN2.cpp'. How can I create a working header 
file and such link the files to make them running????

Thanks a lot!
Lisa


-----------------------------------------------------------------------------
The header file, class declaration
-----------------------------------------------------------------------------
// Kapitel 5 - Programm 7 - BOX.H

class Box
{
    int Laenge;
    int Breite;
public:
    Box(void);         //Konstruktor
    void Setze(int NeueLaenge, int NeueBreite);
    int HoleFlaeche(void) {return (Laenge * Breite);}
    ~Box(void);        //Destruktor
};

-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
The class implementation
-----------------------------------------------------------------------------
                             // Kapitel 5 - Programm 8 - BOX.CPP
#include "box.h"

Box::Box(void)        //Implementation des Konstruktors
{
    Laenge = 8;
    Breite = 8;
}

// Diese Methode setzt die Größe der Box auf die beiden Parameter
void Box::Setze(int NeueLaenge, int NeueBreite)
{
    Laenge = NeueLaenge;
    Breite = NeueBreite;
}

Box::~Box(void)       //Implementation des Destruktors
{
    Laenge = 0;
    Breite = 0;
}
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
The main routine
-----------------------------------------------------------------------------
					
					  // Kapitel 5 - Programm 9 - BOXEN2.CPP
#include <iostream.h>
#include "box.h"

int main()
{
Box Klein, Mittel, Grosz;	     //Drei Boxen

    Klein.Setze(5, 7);
				  // Die mittlere Box verwendet die Werte,
				  // die der Konstruktor vorgibt
    Grosz.Setze(15, 20);

    cout << "Der Flaecheninhalt der keinen Box ist " << 
Klein.HoleFlaeche() << "\n";
    cout << "Der Flaecheninhalt der mittleren Box ist " << 
Mittel.HoleFlaeche() << "\n";
    cout << "Der Flaecheninhalt der grossen Box ist " << 
Grosz.HoleFlaeche() << "\n";

    return 0;
}
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
Jan 02 2005