C Programming
In which stage the following code#includegets replaced by the contents of the file stdio.h

During Execution
During Editing
During linking
None of these
During Preprocessing

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

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

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