#include <iostream>

using namespace std;

void Changer (int & a);
void Keeper (int a);

int main() {
    int data =7;

    cout << "In main data = " << data << endl;
    cout << "Calling Keeper" << endl;
    Keeper(data);
    cout << "In main data = " << data << endl;
    cout << "Calling Changer" << endl;
    Changer(data);
    cout << "In main data = " << data << endl;


    return 0;
}
void Changer (int & a){
    cout << "In Changer a = " << a << endl;
    a = 99999;
    cout << "In Changer a = " << a << endl;
    return;
}

void Keeper (int a){
    cout << "In Keeper a = " << a << endl;
    a = 99999;
    cout << "In Keeper a = " << a << endl;
    return;
}