////   This file contains the C++ code from Program 14.19 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/pgm14_19.cpp//double Pi (unsigned int trials){    unsigned int hits = 0;    for (unsigned int i = 0; i < trials; ++i)    {	double const x = RandomNumberGenerator::Next ();	double const y = RandomNumberGenerator::Next ();	if (x * x + y * y < 1.0)	    ++hits;    }    return 4.0 * hits / trials;}