C Programming
What is the difference between a declaration and a definition of a variable?

A definition occurs once, but a declaration may occur many times.
There is no difference between them.
A declaration occurs once, but a definition may occur many times.
Both can occur multiple times, but a definition must occur first.
Both can occur multiple times, but a declaration must occur first.

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C Programming
Use of functions

All of these
Makes the debugging task easier.
Helps to avoid repeating a set of statements many times.
Enhances the logical clarity of the program.
Helps to avoid repeated programming across programs.

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