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From: Phil Goodwin<pgoodwin@my-dejanews.com>
Subject: Re: Software landmines (loops)
Date: 1998/09/01
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In article <6sfcft$70p$1@hirame.wwa.com>,
  "Robert Martin" <rmartin@oma.com> wrote:
>
> Stephen Leake wrote in message ...
> >"Robert Martin" <rmartin@oma.com> writes:
> >
> >> "Structured Programming", Dijkstra, Dahl, Hoare, Academic Press, 1972. p.
> >> 16-23 "7. On Understanding Programs".    Actualy this section says that
> >> there are two different kinds of loops. one that is tested at the top;
> and
> >> another which is tested at the bottom.  But in all cases, the elements of
> >> structure programming have a single entry and a single exit.  A loop that
> >> exits in the middle, violates this maxim.
> >
> >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.

So what?

Phil

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