From: "Marcin 'Qrczak' Kowalczyk" <qrczak@knm.org.pl>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Integer arithmetic: mod
Date: 4 Aug 2001 20:25:35 GMT [thread overview]
Message-ID: <slrn.pl.9momhv.4c1.qrczak@qrnik.zagroda> (raw)
In-Reply-To: <9khicj$3n3$1@qrnik.zagroda>
Sat, 04 Aug 2001 11:48:07 -0700, Chris Hecker <checker@d6.com> pisze:
> Most computer languages (and chips) simply say "(a/b)*b + a mod b =
> a" and leave it at that.
Fortunately not all, e.g. in Python (-123) % 10 == 7. In C89 the
behavior for negative numbers was left implementation-defined but
in C99 it is specified as truncation towards 0.
> 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".
Haskell has both: div & mod truncate downwards, quot & rem truncate
towards 0.
--
__("< Marcin Kowalczyk * qrczak@knm.org.pl http://qrczak.ids.net.pl/
\__/
^^ SYGNATURA ZASTĘPCZA
QRCZAK
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next parent reply other threads:[~2001-08-05 5:26 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 [this message]
2001-08-05 8:05 ` Chris Hecker
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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