?? pgm14_16.cpp
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//// This file contains the C++ code from Program 14.16 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_16.cpp//long int RandomNumberGenerator::seed = 1L;long int const RandomNumberGenerator::a = 16807L;long int const RandomNumberGenerator::m = 2147483647L;long int const RandomNumberGenerator::q = 127773L;long int const RandomNumberGenerator::r = 2836L;void RandomNumberGenerator::SetSeed (long int s){ if (s < 1 || s >= m) throw invalid_argument ("invalid seed"); seed = s;}double RandomNumberGenerator::Next (){ seed = a * (seed % q) - r * (seed / q); if (seed < 0) seed += m; return (double) seed / (double) m;}
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