Re: Mod (%) function in C/Objective-C?
Re: Mod (%) function in C/Objective-C?
- Subject: Re: Mod (%) function in C/Objective-C?
- From: Scott Ribe <email@hidden>
- Date: Mon, 11 Aug 2014 15:24:08 -0600
On Aug 11, 2014, at 3:03 PM, Dave <email@hidden> wrote:
> My conclusion is (a % b) in C is a remainder operator and NOT modulo operator.
Yes. The first edition of K&R mistakenly referred to it as modulus (apparently based on the PDP-11 instruction which was similarly misnamed). The second edition lists it in the index only under "modulus", yet refers to it exclusively as "remainder" in the text. All the later reference works I have refer to it as remainder, but calling it "mod" became an ingrained habit before the correction, and now that mistake is replicated across vast numbers of web sites. K&R C stated that the direction of truncation and sign of result were machine-dependent for negative operands. The C99 standard tightened that up, making % into a well-specified remainder operator.
--
Scott Ribe
email@hidden
http://www.elevated-dev.com/
(303) 722-0567 voice
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