Variables

Variable

DEFINITION:

Variable is a value  or quantity which may  vary during  program execution is called  a Variable.

Each variable has specific memory location in Memory Unit, where Numerical values or characters can be stored.

We can also call a variable as an Identifier i.e., they identify the varying quantities and stores them in particular memory location.

Example:

Sum=a+b;

In the above example there are “a” and “b” two Identifiers/variables representing two separate quantities in two distinct(different) memory locations.

Similarly Sum is also an variable  name which used to store the sum of two numbers i.e.,(addition of a and b).

                                                MEMORY                                                 

variable a

variable b

variable Sum

             

↔↔↔↔↔↔ memory                           locations

Rules for Naming Variables in C

Ø  A variable name must consist of  a single letter or sequence of characters,digits,or underscore(“_")characters.

Ø Examples:  int total; int  _total; and  int total1;

Ø The first character of a variable name must start with letters,or an underscore character.

Ø Examples:  int total;

Ø The variable length must be a maximum of 8 characters.

Ø In C UPPER CASE  and LOWER CASE letters considrred as an differrnt variable.

Ø Examples:  int  AVG; and int avg ; both are treated as an individual variables .

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