From: "David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>
Subject: Re: GNAT messages and the not operator (pitfall alert!)
Date: 1996/10/30
Date: 1996-10-30T00:00:00+00:00 [thread overview]
Message-ID: <01bbc5fe$823691c0$308371a5@dhoossr.iquest.com> (raw)
In-Reply-To: 1996Oct29.145959.1@corning.com
whiting_ms@corning.com (Matt Whiting) wrote in article
<1996Oct29.145959.1@corning.com>...
> In article <32762A30.D2D@watson.ibm.com>, "Norman H. Cohen"
<ncohen@watson.ibm.com> writes:
> > Robert Dewar wrote:
> >>
> >> Here is another pitfall, pretty horrible if it hits, but fortunately
rare.
> >> Ask an Ada expert what is the value of
> >>
> >> -5 mod 3
> >
> > I agree this is a nasty one, and Ada as a Second Language explicitly
> > warns about it (bottom of page 245), as well as about the only slightly
> > less insidious
>
> Relative to the page 245 warning and the table on page 246, I'm still
confused.
> I'm probably beating a dead horse here, but something still doesn't seem
right.
> If I'm reading the p. 246 table correctly, -5 mod 4 (row 1, column 4,
excluding
> the "header row and column"), should evaluate to 3. However, I just
wrote a
> simple little program using ObjectAda V7.0 which evaluates to -1, which,
BTW,
> is what I would have expected. Taking into account the warning on p.
245, I
> also tried -(5 mod 4). It does give the identical -1 result. Am I
reading the
> table incorrectly?
>
> Matt
>
-5 mod 4 = -(5 mod 4) = -1, but (-5) mod 4 = 3
Is it clear now?
--
David C. Hoos, Sr.,
http://www.dbhwww.com
http://www.ada95.com
next prev parent reply other threads:[~1996-10-30 0:00 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-10-24 0:00 GNAT messages and the not operator (pitfall alert!) Robert Dewar
1996-10-24 0:00 ` Robert Dewar
1996-10-25 0:00 ` whiting_ms@corning.com (Matt Whiting)
1996-10-26 0:00 ` David C. Hoos, Sr.
1996-10-27 0:00 ` Robert Dewar
1996-10-28 0:00 ` Matthew S. Whiting
1996-10-26 0:00 ` John Herro
1996-10-26 0:00 ` Matthew Heaney
1996-10-29 0:00 ` Robert Dewar
1996-10-26 0:00 ` Robert Dewar
1996-10-29 0:00 ` John Herro
1996-10-29 0:00 ` Robert Dewar
1996-10-30 0:00 ` Dr. Peter E. Obermayer
1996-10-30 0:00 ` John Herro
1996-10-30 0:00 ` Robert Dewar
1996-11-01 0:00 ` User Password expiration date extractor? Stein-Aksel Basma
1996-10-29 0:00 ` GNAT messages and the not operator (pitfall alert!) Norman H. Cohen
1996-10-29 0:00 ` whiting_ms@corning.com (Matt Whiting)
1996-10-30 0:00 ` Robert Dewar
1996-10-30 0:00 ` David C. Hoos, Sr. [this message]
1996-10-30 0:00 ` whiting_ms@corning.com (Matt Whiting)
1996-10-30 0:00 ` Norman H. Cohen
1996-10-30 0:00 ` Norman H. Cohen
1996-11-06 0:00 ` Richard A. O'Keefe
1996-11-18 0:00 ` Norman H. Cohen
1996-11-18 0:00 ` Robert Dewar
1996-11-05 0:00 ` Robert Dewar
1996-10-28 0:00 ` Cary Jamison
1996-10-29 0:00 ` Robert Dewar
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