From:	massimin AT triere DOT ens DOT fr (Pascal Massimino)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Random numbers
Date:	28 Jan 1997 22:38:46 GMT
Organization:	Ecole Normale Superieure, Paris, France
Lines:	19
Sender:	massimin AT triere (Pascal Massimino)
Message-ID:	<5clv5m$n2m@nef.ens.fr>
References:	<5ck9gf$ft7$1 AT fizban DOT solace DOT mh DOT se> <32EDC403 DOT 6621 AT ix DOT netcom DOT com>
NNTP-Posting-Host:	triere.ens.fr
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

In article <32EDC403 DOT 6621 AT ix DOT netcom DOT com>, Terence Ramos <de-bug AT ix DOT netcom DOT com> writes:
|> number =3D (rand() % (highNUM-lowNUM)) + lowNUM + 1;

My 2 cents:

 * use some bit masking, if your clipping range is a power of 2 (faster)
   ( e.g.: rand() & 0xff  instead of rand() % 256 )
 * do not use the lowest bits of rand(). Too bad random properties.
   Try printf'ing rand()&0x01 for instance, you'll be surprised.
   So, better use   ( rand()>>4 ) or ( rand()>>7 ), for instance...
 * drand48() returns a double in [0,1[ => you can scale/convert it to int 
   after. _But_ drand48() is slooow...

			Skal

---------------------------------------------------------
Pascal Massimino.         e-mail: Pascal DOT Massimino AT ens DOT fr
http://www.eleves.ens.fr:8080/home/massimin/index.html.en
Ecole Normale Superieure. 45, rue d'Ulm. 75005 Paris.

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