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/*=========================================================================
Program: Visualization Toolkit
Module: TestMinimalStandardRandomSequence.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME
// .SECTION Description
// This program tests the vtkMinimalStandardRandomSequence class.
//
// Correctness test is described in first column, page 1195:
// A seed of 1 at step 1 should give a seed of 1043618065 at step 10001.
//
// ref: "Random Number Generators: Good Ones are Hard to Find,"
// by Stephen K. Park and Keith W. Miller in Communications of the ACM,
// 31, 10 (Oct. 1988) pp. 1192-1201.
// Code is at page 1195, "Integer version 2"
#include "vtkMinimalStandardRandomSequence.h"
#include "vtkDebugLeaks.h"
#include "vtkMath.h"
int TestMinimalStandardRandomSequence(int,char *[])
{
vtkMinimalStandardRandomSequence *seq
=vtkMinimalStandardRandomSequence::New();
seq->SetSeedOnly(1);
bool status=true;
// Check seed has been set
status=seq->GetSeed()==1;
if(status)
{
int i=0;
while(i<10000)
{
// cout << "i=" << i << " seed=" << seq->GetSeed()<< endl;
seq->Next();
++i;
}
status=seq->GetSeed()==1043618065;
if(!status)
{
cout << "FAILED: seed is not 1043618065, it is " << seq->GetSeed()
<< endl;
}
}
else
{
cout << "FAILED: seed is not 1, it is " << seq->GetSeed() << endl;
}
vtkMath::RandomSeed(1);
int i=0;
while(i<9997)
{
// cout << "i=" << i << " seed=" << vtkMath::GetSeed() << endl;
vtkMath::Random();
++i;
}
status=vtkMath::GetSeed()==1043618065;
if(!status)
{
cout << "FAILED: static seed is not 1043618065, it is " << vtkMath::GetSeed()
<< endl;
}
seq->SetSeed(1);
i=0;
while(i<9997)
{
// cout << "i=" << i << " seed=" << vtkMath::GetSeed() << endl;
seq->Next();
++i;
}
status=seq->GetSeed()==1043618065;
if(!status)
{
cout << "FAILED: seed auto is not 1043618065, it is " << seq->GetSeed()
<< endl;
}
seq->Delete();
int result;
if(status)
{
// passed.
result=0;
}
else
{
// failed.
result=1;
}
return result;
}
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