From: Bruce Ellis <bruce.ellis@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] More Microsoft bashing
Date: Fri, 16 Dec 2005 16:27:42 +1100 [thread overview]
Message-ID: <775b8d190512152127j6e9fb048n8db2219b90877e8f@mail.gmail.com> (raw)
In-Reply-To: <20051216050830.GE15067@augusta.math.psu.edu>
any C standard since forever has stated clearly that the
behaviour is undefined. i've never written a program that
mods a negative number. have fun in portability.
brucee
On 12/16/05, Dan Cross <cross@math.psu.edu> wrote:
> On Thu, Dec 15, 2005 at 10:53:06PM -0600, erik quanstrom wrote:
> > | Please note that this definition of DIV and MOD differs from the
> > | definition given in [M. Reiser, N. Wirth. Programming in Oberon. p.
> > | 36]:
> > | x = (x DIV y) * y + (x MOD y), and
> > | 0 <= (x MOD y) < y
> ^^^^^^^^^^^^^^^^^^
> > |
> > | So, what *is* -5 MOD 3?
> > |
> >
> > -2
>
> Are you sure? It looks to me more than it'd be +1. Wirth's definition
> above would tend to indicate that x MOD y is always positive, unless I'm
> reading it wrong, or that's not the whole story (and I confess I'm too
> lazy to look up the definitions in context). If I'm right, that would
> also imply that x DIV y tends more wards negative infinity than zero
> for negative numerators.
>
> - Dan C.
>
>
next prev parent reply other threads:[~2005-12-16 5:27 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-16 4:04 Jack Johnson
2005-12-16 4:51 ` Dan Cross
2005-12-16 5:02 ` Dan Cross
2005-12-16 5:33 ` erik quanstrom
2005-12-16 5:38 ` Bruce Ellis
2005-12-16 10:46 ` Charles Forsyth
2005-12-16 13:13 ` Dan Cross
2005-12-16 4:53 ` erik quanstrom
2005-12-16 5:08 ` Dan Cross
2005-12-16 5:19 ` Brian L. Stuart
2005-12-16 5:27 ` Bruce Ellis [this message]
2005-12-16 14:19 ` Brantley Coile
2005-12-16 15:13 ` Bruce Ellis
2005-12-16 15:29 ` Russ Cox
2005-12-16 16:00 ` Bruce Ellis
2005-12-17 0:26 ` Jack Johnson
2005-12-17 3:59 ` Bruce Ellis
2005-12-16 15:33 ` Brantley Coile
2005-12-16 10:47 ` John Stalker
2005-12-16 14:25 ` Brantley Coile
2005-12-16 14:51 ` Gorka guardiola
2005-12-16 22:28 ` Victor Nazarov
2005-12-17 11:09 ` David Leimbach
2005-12-17 11:24 ` David Leimbach
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