From: Maciej Sobczak <no.spam@no.spam.com>
Subject: Re: Negative float problem
Date: Thu, 03 Nov 2005 16:02:05 +0100
Date: 2005-11-03T16:02:05+01:00 [thread overview]
Message-ID: <dkd8pd$6rd$1@sunnews.cern.ch> (raw)
In-Reply-To: <oq2dkd.1a7.ln@hunter.axlog.fr>
Jean-Pierre Rosen wrote:
> For example, try to find what "%" does in C/C++ (with at least one
> negative operand, of course)...
For fundamental types, this always holds (except when b is 0):
a == (a / b) * b + a % b
If any of a or b is negative, then the sign of a % b is
implementation-defined.
(for user-defined types - like MySuperSafeIntegerWithLotsOfChecks - it's
of course whatever you invent it to be)
I have to admit that I was never concerned with this rule, I just don't
divide modulo negative numbers - this kind of operation simply has no
meaning in any of the domains where I used C/C++.
--
Maciej Sobczak : http://www.msobczak.com/
Programming : http://www.msobczak.com/prog/
next prev parent reply other threads:[~2005-11-03 15:02 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-26 18:32 Negative float problem Luke
2005-10-26 19:05 ` Samuel Tardieu
2005-10-26 20:42 ` Robert A Duff
2005-10-27 8:05 ` Robert I. Eachus
2005-10-27 14:48 ` Robert A Duff
2005-10-27 15:07 ` Maciej Sobczak
2005-10-27 15:47 ` Robert A Duff
2005-10-28 8:34 ` Maciej Sobczak
2005-10-29 23:39 ` Brian May
2005-10-30 9:11 ` Dmitry A. Kazakov
2005-10-31 9:46 ` Maciej Sobczak
2005-10-31 14:20 ` Dmitry A. Kazakov
2005-11-01 11:06 ` Maciej Sobczak
2005-11-01 14:06 ` Robert A Duff
2005-11-01 14:46 ` Martin Dowie
2005-11-01 16:04 ` Hyman Rosen
2005-11-01 17:19 ` Martin Dowie
2005-11-02 0:13 ` Robert A Duff
2005-11-02 6:59 ` Martin Dowie
2005-11-02 13:24 ` Robert A Duff
2005-11-02 15:22 ` Martin Dowie
2005-11-01 15:12 ` Maciej Sobczak
2005-11-02 0:28 ` Robert A Duff
2005-11-02 4:16 ` Steve Whalen
2005-11-14 7:26 ` Dave Thompson
2005-11-20 0:19 ` Robert A Duff
2005-11-20 11:07 ` Dmitry A. Kazakov
2005-11-01 14:27 ` Dmitry A. Kazakov
2005-11-01 15:19 ` Maciej Sobczak
2005-11-01 19:44 ` Dmitry A. Kazakov
2005-11-02 9:04 ` Maciej Sobczak
2005-11-02 11:17 ` Dmitry A. Kazakov
2005-11-02 13:03 ` Maciej Sobczak
2005-11-02 14:20 ` Jean-Pierre Rosen
2005-11-02 20:15 ` Jeffrey R. Carter
2005-11-03 13:06 ` Jean-Pierre Rosen
2005-11-03 18:32 ` Jeffrey R. Carter
2005-11-03 9:51 ` Maciej Sobczak
2005-11-03 13:20 ` Jean-Pierre Rosen
2005-11-03 15:02 ` Maciej Sobczak [this message]
2005-11-03 18:55 ` Frank J. Lhota
2005-11-04 9:32 ` Maciej Sobczak
2005-11-03 20:59 ` Simon Wright
2005-11-02 13:32 ` Robert A Duff
2005-11-02 14:44 ` Dmitry A. Kazakov
2005-11-02 13:47 ` Dmitry A. Kazakov
2005-10-27 18:33 ` Dmitry A. Kazakov
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