////   This file contains the C# code from Program A.2 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C#"//   by Bruno R. Preiss.////   Copyright (c) 2001--2002 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.brpreiss.com/books/opus6/programs/pgm0A_02.txt//public class Example{    public static void One()    {	int x = 1;	Console.WriteLine(x);	Two(ref x);	Console.WriteLine(x);    }    public static void Two(ref int y)    {	y = 2;	Console.WriteLine(y);    }}