COPY CONSTRUCTOR

class code
{
  int id;
  public:
    code(){}           //constructor
    code(int a){id=a} //constructor again
    code(code&x)
    { 
      id=x.id;
    }
   void display(void)
   {
     cout<<id;
   }
};
int main()
{
  code A(100);
  code B(A);
  code C= A;
  code D;
  D=A;
  cout<< id of A:";A.display();
  cout<< id of B:";B.display();
  cout<< id of C:";C.display();
  cout<< id of D:";D.display();
retrun 0;
}

OUTPUT:
         id of A:100;
         id of B:100;
         id of C:100;
         id of D:100;