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It is a designing method, but has nothing to do with the C language.

No its a very useful technique of C Programming

In top down stepwise refinement we start with a psuedocode (it is actually a puseudocode)

First the "Top"...is a single statement, in effect the complete representation of programme.

but cannot give all the details so we do some refinement

We do refinements in steps, like specifing variables and then again refine them by intializing them with specific or desired numbers or values.

So top down stepwise refinements make it easy for us to design a programme...we divide our program from top to down in segments and refine (or define) these segments.

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