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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: float with 24-bit resolution
Date: 17 Aug 2003 12:40:14 +0100
Organization: Pushface
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"Matthew Heaney" <matthewjheaney@earthlink.net> writes:

> "Simon Wright" <simon@pushface.org> wrote in message
> news:x7vy8xuu235.fsf@smaug.pushface.org...
> > "Jeffrey Creem" <jeff@thecreems.com> writes:
> >
> > You need to use the compiler's inbuilt infinite precision arithmetic here:
> >
> > package Angles is
> >
> >    Angle_Delta : constant := 360.0 / 2 ** 23;
> >
> >    type Angle is delta Angle_Delta range -360.0 .. 360.0 - Angle_Delta;
> >    for Angle'Small use Angle_Delta;
> >    for Angle'Size use 24;
> >
> > end Angles;
> 
> This is correct, except that you don't need to subtract the value of
> Angle_Delta when specifying the Angle'Last.  The following declaration is
> perfectly correct:
> 
> Angle_Delta : constant := 360.0 / 2 ** 23;
> type Angle is delta Angle_Delta range -360.0 .. 360.0;  --360, not
> 360-T'Small
> for Angle'Small use Angle_Delta;
> for Angle'Size use 24;

I suppose this is some sort of convenience offered by the compiler? or
is it the ARM? or an AI? because clearly there is no binary
representation of +360.0.