C Programming
What is the base data type of a pointer variable by which the memory would be allocated to it?

No data type
unsigned int
Depends upon the type of the variable to which it is pointing.
float
int

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

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

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