Declaring vs defining variables in c

As I know this is a
declaration:

int
            i;

and this is a
definition:

int i =
            10;

May be
I am wrong I don't argue.

The
question is Does the compiler set aside memory for the declared (but not
defined) variables?

itemprop="text">

class="normal">Answer

Does the
compiler set aside memory for the declared (but not defined)

variables?

No,
compiler just take a note of this variable name and type. No memory is allocated for
declaration.

int i; can
behave as definition if i is used (not optimized out) and href="http://ideone.com/nNy1fu" rel="nofollow">no other definition of
i is present in any other compilation unit and storage will be
reserved for it. (because storage is reserved for definitions)