From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,7a2d45f282a1da1c
X-Google-Attributes: gid103376,public
X-Google-ArrivalTime: 2003-08-17 06:46:22 PST
Path: 
 archiver1.google.com!news1.google.com!newsfeed.stanford.edu!headwall.stanford.edu!newshub.sdsu.edu!elnk-nf2-pas!newsfeed.earthlink.net!stamper.news.pas.earthlink.net!stamper.news.atl.earthlink.net!newsread2.news.atl.earthlink.net.POSTED!not-for-mail
From: "Matthew Heaney" <matthewjheaney@earthlink.net>
Newsgroups: comp.lang.ada
References: <3F3CCB0F.543478AF@adrianhoe.nospam.com.my>
 <Yh4%a.148778$o%2.63694@sccrnsc02> <x7vy8xuu235.fsf@smaug.pushface.org>
 <Zas%a.5307$7z1.3683@newsread3.news.pas.earthlink.net>
 <x7vlltso6ld.fsf@smaug.pushface.org>
Subject: Re: float with 24-bit resolution
X-Priority: 3
X-MSMail-Priority: Normal
X-Newsreader: Microsoft Outlook Express 6.00.2800.1158
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
Message-ID: <OGL%a.20816$BC2.4822@newsread2.news.atl.earthlink.net>
Date: Sun, 17 Aug 2003 13:46:22 GMT
NNTP-Posting-Host: 65.110.133.134
X-Complaints-To: abuse@earthlink.net
X-Trace: newsread2.news.atl.earthlink.net 1061127982 65.110.133.134 (Sun,
 17 Aug 2003 09:46:22 EDT)
NNTP-Posting-Date: Sun, 17 Aug 2003 09:46:22 EDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
Xref: archiver1.google.com comp.lang.ada:41640
Date: 2003-08-17T13:46:22+00:00
List-Id: <comp.lang.ada>


"Simon Wright" <simon@pushface.org> wrote in message
news:x7vlltso6ld.fsf@smaug.pushface.org...
> "Matthew Heaney" <matthewjheaney@earthlink.net> writes:
>
> > 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.

You are correct that the value 360.0 is not in the range, but as a
convenience the language allows you to declare it that way.  This has been
the language rule since Ada83.  See RM95 3.5.9 (13-14 and in particular
22-24, 27).