Give me an expample to differentiate Top down approach and bottom approach of software development?

Many times I get confused to distinguish top down and bottom up approach. Suppose I am considering C and C++ what are the points where I can focus on Bottom apporach of C and top down approach of C++.

in top down approach u first define the entire prblm, define the modules, then classes, objects and finaly the logical operaitons and codes r done. ie from the application level to the primitive level.

in botom up u first define a define a section or part and develop as such, and finaly combine to the whole program, as far as i kno..

Bottom up approach is used when the main module which is in the last is executed first. whereas top down approach is used when the program is executed from the first line to the last..

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