Answer / 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.

Answer / vijoeyz

C has three types of storage: automatic, static and
allocated.

Variable having block scope and without static specifier
have automatic storage duration.

Variables with block scope, and with static specifier have
static scope. Global variables (i.e, file scope) with or
without the the static specifier also have static scope.

Memory obtained from calls to malloc(), alloc() or realloc()
belongs to allocated storage class.

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