```c++
#include <iostream>
using namespace std;
class Myclass
{public:
Myclass (int a,int b) { x=a;y=b;}
friend void copy(Myclass & my);
void print( )
{ cout<<"x="<<x<<endl;
cout<<"y="<<y<<endl;
}
private:
int x,y;
};
void copy(Myclass & my)
{
x=my.x;
y=my.y;
}
int main()
{
Myclass m1(1,2);
Myclass m2(3,4);
m1.print();
m2.print();
copy(m1);
m2.print();
return 0;
}
```