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From: Matthew Heaney <matthew_heaney@acm.org>
Subject: Re: Software landmines (loops)
Date: 1998/09/04
Message-ID: <m3ogsw503u.fsf@mheaney.ni.net>#1/1
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References: <slrn6sopmg.4fg.jdege@jdege.visi.com> <35f51e53.48044143@
 <m3af4mq7f4 <35EDC648.76F03F32@draper.com> <EypnAz.L66@ecf.toronto.edu>
 <35EEF597.A1119EF4@draper.com>
NNTP-Posting-Date: Thu, 03 Sep 1998 21:53:44 PDT
Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada
Date: 1998-09-04T00:00:00+00:00
List-Id: <comp.lang.ada>

Tim McDermott <mcdermott@draper.com> writes:

> I guess the moral of the story is that this stuff really is hard, even at 3
> terms.

Yes!  That's the point I was trying make too.

Although I can reason about a disjunction with two or three terms, I
still prefer a loop predicate with just one term.

By separating the array iteration from the item comparison, I can reason
about the two different termination conditions independently.  So
instead of one (larger) problem with two terms, I have two (smaller)
problems, with one term each.