Storage classes in c
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| Storage classes in c |
Storage Classes in C are used to describe the features of a variable/function. These features basically include the scope, visibility and life-time which help us to trace the existence of a particular variable during the runtime of a program.
So, storage class signifies 4 things:
2.
Default value : what value would it hold if it is not
initialized.
3.
Scope : where the variable is would be available.
4. Life : how long would the variable be available.
1.
Automatic storage class.
2.
Register storage class.
3.
Static storage class.
4.
External storage
class.
There are four type of storage classes in C.
1.
Automatic storage class.
2.
Register storage class.
3.
Static storage class.
4.
External storage
class.
Automatic storage class.
Keyword : auto
Storage :
Memory.
Default value
: garbage (unpredictable value).
Scope: local
to block.
Life: till
control is in the block in which variable is defined .
Register storage class.
Keyword : register.
Storage : CPU
register (internal memory of microprocessor.).
Default value :
garbage .
Scope: local
to block.
Life: till
control is in the block in which variable is defined.
Static storage class.
Keyword :
static.
Storage :
Memory.
Default value
: zero/0
Scope: local
to block.
Life: till the
execution of program does not end.
External storage class.
Keyword :
extern.
Storage :
Memory.
Default value
: zero/0.
Scope: global
(whole the program).
Life: till the execution of program does not
end.
When we storage classes?
Register -for
frequently used variable.
Static – if variable
is to live across function calls.
External – if variable
is required by all functions.
Automatic –
All storage class.
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