#include <bits/stdc++.h>

 using namespace std;

 class A

 {

 public:

     A()

     {

         a=b=;

         cout<<"Default Constructor called.\n";

     }

     A(int i,int j)

     {

         a=i;

         b=j;

         cout<<"Constructor called.\n";

     }

     ~A()

     {

         cout<<"Destructor callled.\n";

     }

     void copy(A &aa);

     void print()

     {

         cout<<a<<","<<b<<endl;

     }

 private:

     int a,b;

 };

 void A::copy(A &aa)

 {

     if(this==&aa)

         return;

     *this=aa;

 }

 int main()

 {

     A a1,a2(,);

     a1.copy(a2);

     a1.print();

 }