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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Newsgroups: comp.lang.ada
Subject: Re: Local vs global variables in ADA
Date: Tue, 05 Nov 2002 18:15:52 -0800
Organization: >> Leaf-Eating Penguins? <<
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Date: 2002-11-06T03:18:35+00:00
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Robert A Duff fed this fish to the penguins on Tuesday 05 November 2002 
02:37 pm:

> Like what?  I mean, which languages have different definitions of
> "while" loops, and what are the differences.  I thought "while" loops
> were one of the few cases where there is pretty much agreement on the
> semantics across languages.
>
        Well, it isn't a while, but...

        repeat
                ...
        until <cond>

which has the situation that it exits when <cond> goes true, whereas

        while <cond>
                ...
        wend

continues looping on a true <cond>.

        And /neither/ structure really handles the form where you need a bit 
of processing before you can do the test...


        loop
                preprocessing which sets flag
            exit when <cond>
                other processing
        end loop.

        Using just a while loop, as in many languages, the above turns into:

        (initial) preprocessing which may set flag
        while not flag
                other processing
                preprocessing which sets flag
        wend



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