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

A declaration occurs once, but a definition may occur many times.
A definition occurs once, but a declaration 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.
There is no difference between them.

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C Programming
A preprocessor command

need not start on the first column
has # as the first character
need not start on a new line
comes before the first executable statement

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