/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <iostream>
#include <vector> ;
using namespace std;
class Q
{
public:
    int x;
    Q();
    Q(const Q& q);
    Q& operator=(const Q& q);
};
Q::Q(): x(0)
{
    cout << "1";

}
Q::Q(const Q& q)
{
    cout << "2";
    x = q.x;

}
Q& Q::operator=(const Q &q)
{
    cout <<"3";
    x = q.x;
    return *this;}
void foo(Q q4, Q& q5)
{
    Q q6 = q4;
    q6 = q5;

}
void bar()
{
    Q q1;
    Q q2 = q1;
    q1 = q2;
    Q q3(q1);
    foo(q1, q2);

}

int main(){
   	bar();
}