#include <iostream>

using namespace std;
void dontChange(int& i );
int main(){
    int i = 0;
    int& r = i;

    r = 7;

    int& j = r;

    cout << r << " " << i << endl;

    dontChange(r);

    cout << r << " " << i << endl;

    return 0;
}

void dontChange(int& i ){
    i++;
}