#include <iostream>

using namespace std;

class CoordT{
    public:
        CoordT(int & x): ref{x} {
           cout << "X is " << ref << endl;
           ref = 1'000'000;
        }
    private:
       int & ref;
};

int main() {

    int x{99};
    int * ptr;
    CoordT coord(x);

    ptr = &x;
    cout << "*ptr = " << *ptr << endl;
    cout << "ptr = " << ptr << endl;
    *ptr = 7;
    cout << "x = " << x << endl;

    cout << endl << endl;

    int & ref{x};
    cout << "ref = " << ref << endl;
    ref = -99;
    cout << "x = " << x << endl;




    return 0;
}