Answer Posted / shahidnx

First thing Top down and bottom up are designing approaches.
As simple, in top down approach,first we are designing the
main module(i.e main function) and in that we will decide
what all other modules to be include then we will design all
other sub modules..this approach is used C prog language.

In bottom up approach, just contrast to top down,first we
design all the sub modules related to application then we
design main module and in that we will decide what are the
modules to be include.. for ex: we can design any no of
classes and in main only required classes and their
functions can be used ...this approach is used in c++ ......

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