From:	ajm AT algonet DOT se (Anders Musikka)
Subject:	SV: Random number generator
8 Jan 1998 16:43:40 -0800 :
Message-ID:	<199801081850.KAA07043.cygnus.gnu-win32@cygnus.com>
Mime-Version:	1.0
To:	"Erric Gilbert" <eegmu AT staff DOT communique DOT net>,
	"'BMullenber'" <BMullenber AT aol DOT com>, <gnu-win32 AT cygnus DOT com>

Detta är ett multipart-meddelande i MIME-format.

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I've included a very simple (but working) random number generator. The
sourcecode is translated pascal code from the book "Algorithms" by Robert
Sedgewick.
Hope it helps!

(also hope that including files is okay on this mailing list? (it's 1.5kb))


----------
Från: Erric Gilbert <eegmu AT staff DOT communique DOT net>
Till: 'BMullenber' <BMullenber AT aol DOT com>; gnu-win32 AT cygnus DOT com
Ämne: RE: Random number generator
Datum:  den 7 januari 1998 22:41


	I don't know of any number generators for C/C++ but there is a
built in $RANDOM function into BASH. You might be able to incorperate
that some how.

> -----Original Message-----
> From:	BMullenber [SMTP:BMullenber AT aol DOT com]
> Sent:	Wednesday, January 07, 1998 3:05 AM
> To:	gnu-win32 AT cygnus DOT com
> Subject:	Random number generator
> 
> Anyone have the source code for a random number generator that
> actually works?
> 
> I am using C++
> 
> I am attempting to get random numbers between 0-100 for a game I wish
> to make
> that requires some sort of randomness with values.
> 
> If anyone has 1 that can do this, please send it or contact me
> 
> Thanks
> 
> Brandon
> BMullenber AT aol DOT com
> -
> For help on using this list (especially unsubscribing), send a message
> to
> "gnu-win32-request AT cygnus DOT com" with one line of text: "help".
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/*
 Program: very simple Linear Congruential Random number generator.
 Author: Anders Musikka (M6 Project)
 notes: See the bottom of this file for some notes about this very =
simple number generator.

(Naturally, I'm not claiming copyright over this short program...)
*/

#include <stdio.h>

#define B 21
#define M 100


int GetRandom()
{
static seed=3D0;            /*It's very important that "seed" is defined =
as static here.*/
seed=3D (seed * B + 1) % M;
return seed;
};

void main()
{
int i;
for (i=3D0;i<100;i++)
  printf("%d\n",GetRandom());
};



/*

 B:                        Should be a random number ending in 21, and =
with
                           the number before 21 even. It should have =
approximately
                           one less digit than M.
                           good choices:
                           82621
                           21
                           bad choices:
                           22222221    - Not very random digits before.
                           1852721     - Uneven number before 21.


 M:                         Any number about 1 digit longer than B. A =
good
                            suggestion is using a power of 2, as this =
makes
                            it possible for the compiler to optimize the
                            % (modulo) operation to an and mask. You
                            can also use the computer-word size - simply
                            remove the % operation.


Literature: "Algorithms" by Robert Sedgewick ISBN 0-201-06672-6

*/

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