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From: juul@diku.dk (Anders Juul Munch)
Newsgroups: comp.lang.c++
Subject: Re: Random number generation
Message-ID: <1991Mar14.204837.4448@odin.diku.dk>
Date: 14 Mar 91 20:48:37 GMT
References: <1991Mar11.151610.1984@linus.mitre.org>
Sender: news@odin.diku.dk (Netnews System)
Organization: Department of Computer Science, U of Copenhagen
Lines: 21

ads@gateway.mitre.org (Alexas D. Skucas) writes:


>  Here is a C++ problem that is really giving me
>headaches.  I am trying to generate a random number
>between 0 and 1.  The rand function returns a huge
>number (i.e 3.75658e+08) which I can't seem to be
>able to deal with.  I am running the Sun CC compiler.

>ANY help would be extremely appreciated. Thanks.


Apparently,  rand() on your system returns a number between 
0 and 2**32-1. Just divide by 2**32 and you get numbers 
evenly distributed between 0 and 1.
	The following function should do the trick:

double rand01()
{ return rand()/4294967296.0; }

-- Anders Munch