Answer Posted / bibhuti bhusan basantaray

C supports 4 types of storage class. They are given
hereundr:-
1> Extern
2> static
3> Register
4> Auto
By default a variable defined inside a block is a auto
variable.It has block level scope.Regsiter storage class
indicates that the variable is stored in the CPU rather
than Memory. So the opeartion is faster because accessing
register is faster then memory.Extern indicates that the
effect of the variable is realised in every object modules.
And finally static .If it is defined inside the
function ,then it's retian its value during different
function call.And it's life is through out the program.And
it's initilized only once.

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