Storage classes in c

In c there are four types of storage class. They are:

1. auto

2. register

3. static

4. extern


Storage class is modifier or qualifier of data types which decides:





1.  In which area of memory a particular variable will be stored?  


2. What is scope of variable?

3. What is visibility of variable?



Visibility of a variable in c:



    Visibility means accessibility. Up to witch