From: Chris Hecker <checker@d6.com>
To: "Marcin 'Qrczak' Kowalczyk" <qrczak@knm.org.pl>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Integer arithmetic: mod
Date: Sun, 5 Aug 2001 01:05:54 -0700 (PDT) [thread overview]
Message-ID: <Pine.BSF.4.21.0108050104090.15727-100000@shell16.ba.best.com> (raw)
In-Reply-To: <slrn.pl.9momhv.4c1.qrczak@qrnik.zagroda>
> > Unfortunately, people (and language and chip designers) assume
> > (-4)/3 = -1 (truncate towards zero) rather than -2 (floor),
> Not all people: Donald Knuth clearly disagrees. He has written
> something along the lines "beware of programming languages which use
> a different definition than the one which says (-4)/3 = -2".
Yeah, Concrete Mathematics by Knuth, Graham, and Patashnik is the
bible for this sort of thing.
> Haskell has both: div & mod truncate downwards, quot & rem truncate
> towards 0.
Ah, that's a good idea, although I'd assume the div floor behavior is
surprising at first.
Chris
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next prev parent reply other threads:[~2001-08-05 8:06 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <9khicj$3n3$1@qrnik.zagroda>
2001-08-04 20:25 ` Marcin 'Qrczak' Kowalczyk
2001-08-05 8:05 ` Chris Hecker [this message]
2001-08-06 1:06 ` John Gerard Malecki
2001-11-19 16:39 Krishnaswami, Neel
-- strict thread matches above, loose matches on Subject: below --
2001-11-09 10:30 Edmund GRIMLEY EVANS
2001-11-19 15:49 ` Xavier Leroy
2001-11-19 16:48 ` Vesa Karvonen
2001-08-06 13:23 Dave Berry
2001-08-04 10:49 Kai Kaminski
2001-08-04 18:48 ` Chris Hecker
2001-08-05 23:35 ` John Max Skaller
2001-08-10 22:10 ` Kai Kaminski
2001-08-06 9:10 ` Xavier Leroy
2001-08-10 22:29 ` Kai Kaminski
2001-08-13 15:21 ` Xavier Leroy
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