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From: "Agent" <agent@siu.edu>
Subject: Re: Software landmines (loops)
Date: 1998/08/31
Message-ID: <6sfcu4$bks@saluki-news.it.siu.edu>#1/1
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Date: 1998-08-31T00:00:00+00:00
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Robert Martin wrote in message <6sfcft$70p$1@hirame.wwa.com>...
>Stephen Leake wrote in message ...
>>If there is only one 'exit' statement, why is this bad?
>>
>>loop
>>    ... stuff
>>    exit when ;
>>    ... stuff
>>end loop;
>>
>>One entry, one exit. Perfectly clear. There's nothing magic about
>>putting the exit statement at the top or the bottom!
>
>In fact there is.  If the exit condition is at the top or the bottom,
then
>the body of the loop will always be excuted an exact integral number of
>times.  However if the loop condition is in the middle, then the loop
body
>will be executed a fractional number of times.


There are two "loop bodies" in this case.  The upper body will be
executed n times, and the lower body will be executed n-1 times.  It is
a little more difficult to keep track of, but mid-decision loops *are*
useful; Knuth thinks so, anyway, and I agree based on my own
experiences.

-- Agent