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-Thread: 103376,9ea5d59767aa4a7d
X-Google-NewGroupId: yes
X-Google-Attributes: gida07f3367d7,domainid0,public,usenet
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news1.google.com!postnews.google.com!v6g2000prd.googlegroups.com!not-for-mail
From: Adam Beneschan <adam@irvine.com>
Newsgroups: comp.lang.ada
Subject: Re: Truncating a fixed-point value
Date: Fri, 9 Jul 2010 16:21:34 -0700 (PDT)
Organization: http://groups.google.com
Message-ID: <6d238b76-10ba-4ac8-ac16-86bc691fc96f@v6g2000prd.googlegroups.com>
References: 
 <732bea9d-aacb-4b87-b64b-657aabce6736@w31g2000yqb.googlegroups.com>
	<m2d3uwwg1v.fsf@pushface.org>
NNTP-Posting-Host: 66.126.103.122
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
X-Trace: posting.google.com 1278717694 28346 127.0.0.1 (9 Jul 2010 23:21:34
 GMT)
X-Complaints-To: groups-abuse@google.com
NNTP-Posting-Date: Fri, 9 Jul 2010 23:21:34 +0000 (UTC)
Complaints-To: groups-abuse@google.com
Injection-Info: v6g2000prd.googlegroups.com; posting-host=66.126.103.122;
	posting-account=duW0ogkAAABjRdnxgLGXDfna0Gc6XqmQ
User-Agent: G2/1.0
X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; WOW64;
	SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.21022; .NET CLR
	3.5.30729; .NET CLR 3.0.30618; .NET4.0C),gzip(gfe)
Xref: g2news1.google.com comp.lang.ada:12302
Date: 2010-07-09T16:21:34-07:00
List-Id: <comp.lang.ada>

On Jul 9, 1:34=A0pm, Simon Wright <si...@pushface.org> wrote:
> Adam Beneschan <a...@irvine.com> writes:
> > I must be suffering from an embarrassing mental block, because I'm
> > sure there's a simple solution, but I can't see what it is.
>
> > I have a value X of a fixed-point type, X >=3D 0.0, and I need to
> > compute Floor(X) as an Integer. =A0'Truncation and 'Floor aren't define=
d
> > for fixed-point types; the type conversion Integer(X) rounds; and
> > Integer(X-0.5) fails if X=3D0.0.
>
> > How do others do this? =A0Or do I have to resort to an IF statement (or
> > conditional expression in Ada 2012) to handle the different cases?
>
> Looks as though Integer(X+0.5)-1 might do the trick ..

Yes, it looks like it, as long as X >=3D 0.0 and 0.5 is a model number
of the fixed-point type (I think I'm using the right term).  Those
conditions do hold for the code I need it for.  It isn't useful for
negative numbers---it yields -2 if X=3D-1.0, which is not useful whether
you want a truncation or a floor operation---but I did stipulate
nonnegative X in my original question.

                         -- Adam