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Newsgroups: comp.lang.ada
From: anon@anon.org (anon)
Subject: Re: Puzzling small piece of code - exception block essentially used
 as goto
Reply-To: anon@anon.org (anon)
References: <vQ68i.99$UD4.49@trndny07>
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Date: Tue, 05 Jun 2007 07:58:49 GMT
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Looks like a HOMEWORK problem to me:
And I do not help students cheat!

In <vQ68i.99$UD4.49@trndny07>, Anonymous Coward <anonymous@coward.org> writes:
>This is an excerpt from some code I recently encountered (it may give
>some of you a headache):
>
>  Still_Looping := True;
>
>  Delta_Beyond_Max_Minutes:
>    while Still_Looping loop
>
>      Handle_Max_Minute_Error:
>        begin
>
>          Hour_Delta    := New_Hour - Hour;
>          Still_Looping := False;
>          Hour          := New_Hour;
>
>        exception
>          when Constraint_Error =>
>
>            if New_Hour > Hour then
>
>              Hour_Delta := Max_Hour_Delta
>
>            else
>
>              Hour_Delta := Relative_Time - Max_Hour_Delta;
>
>            end if;
>
>            Hour := Hour + Hour_Delta;
>
>        end Handle_Max_Minute_Error;
>    end loop Delta_Beyond_Max_Minutes;
>
>Tests show that this code actually loops a few times when run in a
>typical state.  What I would like clarification on is when the
>exception block ends, where is control returned to?
>
>Also, anyone up for the challenge of rewriting this without the
>exception handler so the rest of us humans can understand what it's
>doing?