copy constructor

#include "stdafx.h"

#include<iostream>

#include<conio.h>

using namespace std;

class code

{

int id;

public:

code(){ id = 0; }

code(int a)

{

id = a;

}

code(code &x)

{

id = x.id;

}

void display(void)

{

cout << id;

}

};

void main()

{

code a(199);

code b(a);

code c = a;

code d;

d = a;

cout << "code 1 : "; a.display();

cout << "\n code b : "; b.display();

cout << "\n code c : "; c.display();

cout << "\n code d : "; d.display();

_getch();

}