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Ezhumalai

important for all beginers
1 Answer(s) 6 months and 5 days ago
Posted in : Java Beginners

what is the difference for top down approach and bottom up approach with a example program of source code with clear explanation?

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November 16, 2012 at 1:24 PM

In Top-down approach, an overview of the system is first formulated, specifying but not detailing any first-level subsystems. Each subsystem is then refined in yet greater detail, sometimes in many additional subsystem levels, until the entire specification is reduced to base elements.

In Bottom-up approach, the individual base elements of the system are first specified in great detail. These elements are then linked together to form larger subsystems, which then in turn are linked, sometimes in many levels, until a complete top-level system is formed.

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