Define Storage Classes of c program - computer programming?

Each variable and function in C language has two attributes that are type and storage class. If storage class of a variable is not specify in its declaration the compiler will suppose a storage class dependent on the context in which the variable is used. The C language has got certain default storage classes.

A variable name identifies a few physical locations within the computer where the string of bits representing the variable's name is stored. The storage class determines whether the value is in CPU registers or memory.

The storage class of a variable tells

1. Where the variable should be stored?
2. What will be the initial value of the variable, if the initial value is not specifically assigned?
3. What is the scope of the variable in which functions the value of the variable would be available?
4. What is the life of the variable; i.e. how long would the variable exist?