////   This file contains the C++ code from Program 2.6 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/pgm02_06.cpp//int GeometricSeriesSum (int x, unsigned int n){    int sum = 0;    for (unsigned int i = 0; i <= n; ++i)    {	int prod = 1;	for (unsigned int j = 0; j < i; ++j)	    prod *= x;	sum += prod;    }    return sum;}