Answer Posted / babu

There are two storage classes : Automatic and Static.

Automatic objects are local to block,and are discarded on
exit from the block.Declaration with in a block create
automatic objects if no storage class spections is
mentioned , or if the auto specifier is used.Object
declared as register are automatic,and are (if Possible)
stored in fast registers of the machine.

Static obj may be local to a block or external to all
blocks,but in either case retain their values across exit
from and reentry to function and blocks.Within a block
including a block that provides the code for a function,
static objects are declared with the keyword Static.
The objects declared outside all blocks,at the same level
as function definitions,are always static keyword;this
gives them Internal Linkage.
They become global to an entire program by omitting an
explicit storage class ,or by using keyword Extern;this
gives external linkage.

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