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Message-ID: <5Wb2SFBW39WRFw4H@ada-augusta.demon.co.uk>
From: Mike H <postmaster@ada-augusta.demon.co.uk>
Reply-To: Mike Hopkins <postmaster@ada-augusta.demon.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Marble Clock
References: <7075541f-01b7-4cd4-997f-b0b8048f067d@googlegroups.com>
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Date: Wed, 3 Apr 2013 08:44:22 +0100
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Date: 2013-04-03T08:44:22+01:00
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In message <7075541f-01b7-4cd4-997f-b0b8048f067d@googlegroups.com>, 
gattamaneni abhiram <abhiram.gattamaneni@gmail.com> writes
>Can anyone please help me with the logic in the program?

Stand back and list what properties do the trays share with each other 
and in what ways they differ. Then look at those lists of properties as 
abstractions and try to decide whether each, in turn, has any of the 
characteristics of a stack, of a queue or of neither.

If you spot sufficient shared properties, you might even gather some 
extra brownie points with your assessor by considering whether to use 
generic objects.
-- 
Time flies like an arrow. Fruit flies like a banana.
Mike