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Message from discussion Past overflow discussion
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Nick Keighley  
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 More options Sep 5 2009, 10:29 am
Newsgroups: comp.lang.c, comp.std.c
From: Nick Keighley <nick_keighley_nos...@hotmail.com>
Date: Sat, 5 Sep 2009 07:29:31 -0700 (PDT)
Local: Sat, Sep 5 2009 10:29 am
Subject: Re: Past overflow discussion
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On 5 Sep, 06:00, Frank <merr...@lomas-assault.net> wrote:

> On Sep 4, 2:31 pm, Richard Heathfield <r...@see.sig.invalid> wrote:

<snip>

> > The claim was made that there is no standard way to detect overflow in
> > C. I demonstrated that the claim was false, by showing a way to
> > detect overflow (*before* the event) in standard C. I also pointed
> > out that any implementation is already free to provide an extension
> > by which overflows can be detected in some non-standard way.

> I'm surprised that IEEE stuff doesn't cover this for C.  It does for
> fortran.  I notice in H&S V a single reference to IEEE, on p 135: IEEE
> support in C is optional.

> What does that mean?  

in the 1999 C IEEE support is optional. There are ways for a program
to determine if IEEE is supported on a particular implementation. If
it is then various IEEE thingies are available. I'm not sure if
overflow detection is included. Of course IEEE only applies to
floating
point.

> In fortran, you just build around the IEEE
> modules.  Is there a corresponding set of code for C?

As noted above, C *may*, but doesn't have to, support IEEE.
C allows for other types of floating point presumably old ones
or simple ones of embedded systems.

 
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