using System;
public class Doubler
{
    public static void DoubleIt(int num)
    {
        num = num * 2;
        Console.WriteLine("Doubled: num = {0}", num);
    }
}// Doubler

public class DoublerTest
{
    public static void Main()
    {
        int num = 2;
        Console.WriteLine("num is {0}", num);
        Doubler.DoubleIt(num);
        Console.WriteLine("num after double is {0}", num);
    } // Main
} //DoublerTest