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From: Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
Newsgroups: comp.lang.ada
Subject: Re: Valid on QNaN generates exception, compiler bug?
Date: 01 Feb 2002 09:12:35 -0500
Organization: NASA Goddard Space Flight Center
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"Steve Doiel" <nospam_steved94@attbi.com> writes:

>   In ObjectAda 7.2 (WinNT x86) I have found that if I assign a value of
> 16#FFC0_0000# (QNaN) to a 32 bit floating point value using unchecked
> conversion, then I try to check the value using 'VALID, I get a
> Constraint_Error, numeric overflow exception.
> 
>   Is this a compiler bug?

No. "NaN" stands for "Not a Number". float_value'Valid checks to see
if 'float_value' holds a valid floating point number. It does not, so
Constraint_Error is raised.

-- 
-- Stephe