72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "ns3/command-line.h"
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#include "ns3/nstime.h"
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#include "ns3/random-variable-stream.h"
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#include "ns3/simulator.h"
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#include <iostream>
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/**
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* \file
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* \ingroup core-examples
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* \ingroup randomvariable
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* Example program illustrating use of ns3::RandomVariable
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*/
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using namespace ns3;
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/**
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* This program can be run from ns3 such as
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* `./ns3 run sample-random-variable`
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*
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* This program is about as simple as possible to display the use of ns-3
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* to generate random numbers. By default, the uniform random variate that
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* will be outputted is 0.816532. Because ns-3 uses a fixed seed for the
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* pseudo-random number generator, this program should always output the
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* same number. Likewise, ns-3 simulations using random variables will
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* behave deterministically unless the user changes the Run number or the
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* Seed.
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*
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* There are three primary mechanisms to change the seed or run numbers
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* from their default integer value of 1:
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*
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* 1. Through explicit call of SeedManager::SetSeed () and
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* SeedManager::SetRun () (commented out below)
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* 2. Through the passing of command line arguments such as:
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* ./ns3 run program-name --command-template="%s --RngRun=<value>"`
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* 3. Through the use of the NS_GLOBAL_VALUE environment variable, such as:
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* `$ NS_GLOBAL_VALUE="RngRun=<value>" ./ns3 run program-name`
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*
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* For instance, setting the run number to 3 will change the program output to
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* 0.775417
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*
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* Consult the ns-3 manual for more information about the use of the
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* random number generator
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*/
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int
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main(int argc, char* argv[])
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{
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CommandLine cmd(__FILE__);
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cmd.Parse(argc, argv);
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// SeedManager::SetRun (3);
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Ptr<UniformRandomVariable> uv = CreateObject<UniformRandomVariable>();
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std::cout << uv->GetValue() << std::endl;
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}
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