EvtRandomEngine.cc

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 1998      Caltech, UCSB
//
// Module: EvtRandomEngine.cc
//
// Description: routines to generate random numbers
//              really trivial random number
//              implementation.
//
// Modification history:
//
//    RYD      December 25, 1999           Module created
//
//------------------------------------------------------------------------
//
#include "EvtPatches.hh"
 
#include "EvtRandomEngine.hh"
#include <iostream>
#include <math.h>
#include <stdio.h>
 
double EvtRandomEngine::random() {
 
  static unsigned long int next = 1;
 
  next          = next * 1103515245 + 123345;
  unsigned temp = (unsigned)( next / 65536 ) % 32768;
 
  return ( temp + 1.0 ) / 32769.0;
}