017CopyConstructorPr6_4.cpp

#include <iostream>
using namespace std;

class code
{
     private:
          int id;
     public:
          code()         //constructor
          {

          }

          code(int a)    //constructor again
          {
               id = a;
          }

          code(code &x)  //copy constructor
          {
               id = x.id;     //copy in the value
          }

          void display(void)
          {
               cout<<id;
          }
};

int main()
{
     code A(100);   //Object A is created and initialized
     code B(A);     //copy constructor called
     code C = A;    //copy constructor called again

     code D;   //D is created, not initialized
     D = A;         //copy constructor not called

     cout<<"\n id of A: ";A.display();
     cout<<"\n id of B: ";B.display();
     cout<<"\n id of C: ";C.display();
     cout<<"\n id of D: ";D.display();
     cout<<endl;
     return 0;
}