Variable: Declaration, initialization and Usage

Variable

Variables are the names given to some memory location where a value is stored; the variable is corresponding to the data or value input in it.

RULES FOR DEFINING A VARIABLE / VARIABLE NAME:

• · A Variable name should not have name of any KEYWORDS in C.
• · A Variable name can be alphanumeric but should start with an Alphabet.
• · A Variable name should not consist of any special symbol other than “_” Underscore Symbol. 
• · A Variable should be defined before using it.

VARIABLE DECLARATION:

In this step, the variables are declared, this steps always occurs before using the variables.

FORMAT:

 EXAMPLE:

VARIABLE INITIALIZATION:

Providing a Value to any variable is called initialization.

INITIALIZATION AT THE TIME OF DECLARATION:

The variable can be given its value at the time of declaration.

USAGE OF VARIABLE:

Here is the example, to show how a variable is used in formulas to find out some values: