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From: gwyn@brl-tgr.UUCP
Newsgroups: net.math
Subject: Re: Ok, I give up!
Message-ID: <2112@brl-tgr.ARPA>
Date: Fri, 31-Jan-86 17:05:10 EST
Article-I.D.: brl-tgr.2112
Posted: Fri Jan 31 17:05:10 1986
Date-Received: Mon, 3-Feb-86 05:47:07 EST
References: <11594@ucbvax.BERKELEY.EDU>
Organization: Ballistic Research Lab
Lines: 14

> "%" is supposed to be a mod function ...

No, in C the % operator is a remainder operator.
Remember that C is intentionally vague on semantics
in cases where precise specification might have forced
additional run-time overhead in generated code.
Another example is sign propagation on right-shifts.

Yes, to get precise semantics you have to provide
your own function (although this one really should be
provided in the standard C library).

Knuth Vol. 1 (2nd Ed.), p. 38 discusses the reasonable
mathematical definition of the mod function.