////   This file contains the C++ code from Program A.1 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C++"//   by Bruno R. Preiss.////   Copyright (c) 1998 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm0A_01.cpp//void Two (int x){    x = 2;    cout << x << endl;}void One (){    int y = 1;    Two (y);    cout << y << endl;}