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Top down and bottom up approach

 
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mahithegenius

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Joined: 28 Apr 2006
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PostPosted: Tue May 23, 2006 6:12 pm    Post subject: Top down and bottom up approach
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hi,
everyone.Please help in knowing the difference between the Top down approach languages(eg.COBOL) and Bottom up approach languages(eg.C++) because for every language the control comes from the top.Please help me from the above confusion.

mahi
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humpty
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Joined: 01 May 2005
Posts: 23

PostPosted: Thu May 25, 2006 10:48 am    Post subject: Re: Top down and bottom up approach
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hi

In the top-down model an overview of the system is formulated, without going into detail for any part of it. Each part of the system is then refined by designing it in more detail. Each new part may then be refined again, defining it in yet more detail until the entire specification is detailed enough to validate the model.

By contrast in bottom-up design individual parts of the system are specified in detail. The parts are then linked together to form larger components, which are in turn linked until a complete system is formed.
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