From 7077560650063709104 X-Google-Thread: f78e5,c063db358aabf0d8 X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news2.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newscon02.news.prodigy.net!prodigy.net!newsfeed-00.mathworks.com!peer-uk.news.demon.net!kibo.news.demon.net!mutlu.news.demon.net!news.demon.co.uk!demon!stump.algebra.com!devnull From: jm@bourguet.org (Jean-Marc Bourguet) Newsgroups: comp.std.c++ Subject: Re: Integer division specification Date: Tue, 20 Feb 2007 21:55:23 GMT Organization: Guest of ProXad - France Lines: 28 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: <87y7msh56h.fsf@news.bourguet.org> References: <45d8adcb$0$7365$19deed1b@news.inter.NL.net> <45db3f12$0$428$19deed1b@news.inter.NL.net> NNTP-Posting-Host: news.news.demon.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: news.demon.co.uk 1172008530 4104 158.152.254.254 (20 Feb 2007 21:55:30 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Tue, 20 Feb 2007 21:55:30 +0000 (UTC) X-Original-To: std-c++@mailman.ucar.edu X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Virus-Scanned: amavisd-new at csse.unimelb.edu.au X-Received: (from fjh@localhost) by mulga.csse.unimelb.edu.au (8.13.8+Sun/8.13.8/Submit) id l1KLtN5h006550; Wed, 21 Feb 2007 08:55:23 +1100 (EST) X-Path: comp-std-cpp-robomod!not-for-mail X-NNTP-Posting-Date: 20 Feb 2007 22:48:03 MET X-Delivered-To: std-c++@mailman.ucar.edu X-Authentication-Warning: mulga.csse.unimelb.edu.au: fjh set sender to devnull@stump.algebra.com using -f X-Newsgroups: comp.std.c++ Xref: g2news2.google.com comp.std.c++:5655 M.Kronenburg@inter.nl.net ("Maarten Kronenburg") writes: > After all, when -4 / 3 == -2 (instead of -1), while 4 / 3 == 1, then > obviously something strange is going on. You can wonder why Knuth defined MMIX so that its division operates this way. See also http://mathworld.wolfram.com/IntegerDivision.html which define integer division in exactly that way. Practically, I remember few use of integer division or remainder with negative operands. All divisions needed the version C99 mandates. Things change when you consider the remainder: the two versions seems to me about as usefull. For what it worth, Ada defines / as Fortran, but has two remainder operators: mod (which is periodic) and rem (which is odd). Yours, -- Jean-Marc --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.comeaucomputing.com/csc/faq.html ]