Declarations of Variables

     All variables present in the problem must be declared before it is used. This is done with the help of declaration statement. The general form is

Data-type variable list;

                       Where,

                                  Data-type            -              valid data type such as int, char etc.

                                  Variable unit        -              list of variable separated by comma.

Example:              

               

          Int  a, b, c;

This declares a, b and c as integer variables and allocate memory space.

Use of declaration:

i.                     It gives name to memory location

ii.                   It allocates memory space

iii.                  It gives the types of data

Giving Values to variables:

               

        Giving values to already declared variables is called assigning values to variables.  this is done with the help of assignment operator (=). The general form is

Variable name  =             value;

Example:

1.                   X     =             20;

2.                   PI    =             3.14;

Initializing variable:

The process of assigning initial values to variables is called initializing variables. This is done at the time of declaration. the general form is

Data-type variable = initial value;

Example:

1.       Int  a11                 =             100;

2.       Char sex               =             ‘F’;

3.       Double pay         =             80.32;

4.       Int a, b                  =             20;