Storage Classes 1

Storage Classes are used to describe about the features of a variable. 

Basically there are four things that will decide the storage classes-

• Default Value
• Memory (Where it Stored)
• Scope (Visibility)
• Life

There are four storage classes in C Language are given bellow -

1. Auto
2. Static
3. Extern
4. Register 

Auto Storage Classes :- 

Default Value :- 

• For local variable if we don't specify any storage type, then the compiler will treat that as auto .
• All auto variable are local variable but we can not say all local variable auto variable.

Memory :-

• Auto variable are present in function stack frame.

Scope :-

• Scope of an auto is within a function or within block where it is declared.

Life :-

• Life of an auto variable start when function execution start and ends when function execution ends.

Important Note :     

                              Re-Initialization is allowed for auto storage class. 

                              We should not catch Auto variable address while returning from the function.

Remaining storage classes will discuss in next post.