Xref:	news2.mv.net comp.os.msdos.djgpp:8023
From:	Erik Max Francis <max AT alcyone DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: random() and rand() question
Date:	Thu, 29 Aug 1996 07:40:29 -0700
Organization:	Alcyone Systems
Lines:	17
Message-ID:	<3225ABDD.7AF48E03@alcyone.com>
References:	<DwvF3A DOT H2r AT interactive DOT net>
NNTP-Posting-Host:	newton.alcyone.com
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

J.J. Pierson wrote:

> Silly question... How would I go about getting a random number from say 1
> to a specified number?

For a number between 1 and n, use 

    rand()%n + 1.

If n is an even power of 2, then bitwise-anding a mask will be faste:

    rand()&(n - 1) + 1.

-- 
Erik Max Francis, &tSftDotIotE   http://www.alcyone.com/max/   max AT alcyone DOT com
San Jose, California   ICBM 37 20 07 N 121 53 38 W   R^4: the 4th R is respect
"Out from his breast/his soul went to seek/the doom of the just." -- _Beowulf_

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