Pointer/reference test

#include <iostream>

using namespace std;

int main() {
    int *x;
    *x = 10;
    cout << "When int* x = 10:\n";
    cout << x << endl;
    cout << *x << endl;
    cout << &x << endl << endl;

    *x = 5;
    cout << "When *x = 5:\n";
    cout << x << endl;
    cout << *x << endl;
    cout << &x << endl << endl;

    int q = &x;
    q = 4;
    cout << "When q = &x and q = 4:\n";
    cout << x << endl;
    cout << *x << endl;
    cout << &x << endl << endl;
}