Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!zardoz!dhw68k!arcturus!evil
From: evil@arcturus.UUCP (Wade Guthrie)
Newsgroups: comp.lang.c
Subject: Re: A question of style
Message-ID: <6723@arcturus>
Date: 11 Dec 89 17:44:28 GMT
References: <547@mars.Morgan.COM> <1989Nov30.001947.14883@aqdata.uucp> <427@jhereg.Minnetech.MN.ORG> <565@s5.Morgan.COM> <11740@smoke.BRL.MIL>
Organization: Rockwell International, Anaheim, CA
Lines: 28


In article <565@s5.Morgan.COM> amull@Morgan.COM (Andrew P. Mullhaupt) writes:
>I would like to elaborate: There are no good excuses for the comma
>operator . . .

and gwyn@smoke.BRL.MIL (Doug Gwyn) responds:
>. . .It has uses primarily in macros, occasionally in conditionals.

I always thought that an interesting use for the comma was in a for
loop when one wanted, say, to create the identity matrix:

	float	array[SIZE][SIZE];
	int	i,j;

	/* initialize the whole thing to zero, then to this: */
	for(i=0,j=0; i<SIZE; i++, j++)
		array[i][j] = 0;

Although, I guess, you don't need two indices for this.


Wade Guthrie
evil@arcturus.UUCP
Rockwell International
Anaheim, CA

(Rockwell doesn't necessarily believe / stand by what I'm saying; how could
they when *I* don't even know what I'm talking about???)