Article View: comp.std.c
Article #3020Re: (long) x and (long) floor(x)
From: Peter Loibl
Date: Mon, 14 Dec 1992 15:43
Date: Mon, 14 Dec 1992 15:43
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1338 bytes
pjh@cs.tut.fi (Haavisto Petri) writes:
>I just spent several hours debugging a simple program and before
>crying Compiler Bug I would like to make sure that there is one.
>I don't have the standard, but it seems clear to me that given an
>expression of type double with a positive value, the following
>should always be true:
> (long) (expression) == (long) floor(expression)
>Does the standard guarantee this or is there a loop hole that has to
>do with finite precision arithmetic and which allows the compiler to
>do what it chooses?
I don't have the standard at hand right now, but
(long) (expression) == (long) floor((double)expression)
should be true. ^^^^^^
Peter Loibl
pal@regent.e-technik.tu-muenchen.de
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Newsgroups: comp.std.c Path: arc1-ca.pugleaf.net!sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!ira.uka.de!math.fu-berlin.de!informatik.tu-muenchen.de!lrz-muenchen.de!regent!pal From: pal@regent.e-technik.tu-muenchen.dbp.de (Peter Loibl) Subject: Re: (long) x and (long) floor(x) Message-ID: <pal.724347812@regent.e-technik.tu-muenchen.de> Sender: news@regent.e-technik.tu-muenchen.de (News System) Organization: Technical University of Munich, Germany References: <1ghtanINNcf9@cs.tut.fi> Date: Mon, 14 Dec 1992 15:43:32 GMT Lines: 21