#include <iostream>

using namespace std;

void fn1();
int x = 1, y = 2;

int main(){
    cout << "Begin.." << endl;
    cout << "x = " << x << endl;
    cout << "y = " << y << endl;
    cout << "Evaluate x and y in main() ..." << endl;
    int x = 10, y = 20;
    cout << "x = " << x << endl;
    cout << "y = " << y << endl;
    cout << "Step into fn1() ..." << endl;
    fn1();
    cout << "Back in main()" << endl;
    cout << "x = " << x << endl;
    cout << "y = " << y << endl;
    return 0;
}

void fn1(){
    int y = 20;
    cout << "x = " << x << endl;
    cout << "y = " << y << endl;
}