#include <iostream>
using namespace std;

// illustrates scope
 int first = 4;

int main()
{
    int first = 4;
    int second = 0;

    while (first < 10)
    {   
        int second = first * 2;                // shadows main's second
        cout << "\tsecond = " << second << endl;
        first *= 2;
        if (first > 10)
        {   
            int first = second;                // shadows main's first
            first = first/10;
            cout << "\tfirst = " << first << endl;
        }
        cout << "first = " << first << endl;
    }
    cout << "second = " << second << endl;

    return 0;
}