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Date: Tue, 23 May 2006 19:53:53 +0200
From: Georg Bauhaus <bauhaus@futureapps.de>
Organization: future apps GmbH
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Newsgroups: comp.lang.ada,comp.lang.fortran
Subject: Re: Ada vs Fortran for scientific applications
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Date: 2006-05-23T19:53:47+02:00
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Dick Hendrickson wrote:

> What does Ada say about things like  COS(1.1E300)?
> It's unclear to me what that could or should mean on a
> machine with finite (or at least less than 300 ;) ) digits
> of precision.

It means the compiler will tell you ;-)

Messages will indeed depend on the amount of digits possible,
but compilers cannot give up just because of a slightly bigger
number.

     4.       if 1.1E300 < 1.2E300 then
                         |
        >>> warning: condition is always True

This can be compiled, and can be used in conditionals etc. without
trouble.

The generic Ada.Numerics.Generic_Elementary_Functions
can be instantiated with any floating point type, so if you get
a type definition of at least 300 digits past the compiler, then
COS(1.1E300) might well have its standard meaning ;-)


-- Georg