From: whiting_ms@corning.com (whiting_ms@corning.com (Matt Whiting))
Subject: Re: GNAT messages and the not operator (pitfall alert!)
Date: 1996/10/29
Date: 1996-10-29T00:00:00+00:00 [thread overview]
Message-ID: <1996Oct29.145959.1@corning.com> (raw)
In-Reply-To: 32762A30.D2D@watson.ibm.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
next prev parent reply other threads:[~1996-10-29 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) [this message]
1996-10-30 0:00 ` Robert Dewar
1996-10-30 0:00 ` David C. Hoos, Sr.
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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