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From: jrv@mitre-bedford.ARPA
Newsgroups: net.lang.c
Subject: modulus fn with negatives
Message-ID: <13334@sri-arpa.UUCP>
Date: Sun, 9-Sep-84 20:29:00 EDT
Article-I.D.: sri-arpa.13334
Posted: Sun Sep  9 20:29:00 1984
Date-Received: Fri, 14-Sep-84 06:00:39 EDT
Lines: 12

>Should ((-2) % 3) equal -2 or 1?  Our machine returns -2, but the posted
>corewars game seems to assume a%b always returns 0..b-1; is modulus for
>negative lefthand args well defined?  What about Pascal mod function?
>Modula Modulus?  Accepted mathematical definition of modulus?
>                                                Merlyn % Leroy

K&R apparently allow for either kind, but every time I've USED a
modulus function, I needed one that returned a nonnegative
number, whether the dividend was positive or negative. Has
anyone ever needed the other kind?  Has anyone ever needed a
modulus with a negative divisor?
                                        - Jim Van Zandt