////   This file contains the C++ code from Program 14.18 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_18.cpp//double SimpleRV::Sample ()    { return RandomNumberGenerator::Next (); }double UniformRV::Sample ()    { return u + (v - u) * RandomNumberGenerator::Next (); }double ExponentialRV::Sample ()    { return -mu * std::log (RandomNumberGenerator::Next ()); }