Variable and Constant

Variable and Constant

Different between variable and constant is we can modify variable value. But cannot change constant value.

Variable

Variables are container to sore values. We can rewrite these value on run time. Variables are User defined name. Every variable has unique name. Which was used in inner of program. For example

int employe;

employe is the variable that used to hold a data.

Constant 

Its a values or identifier. It cannot alter value on run time. The declaration of constant must be on top of the program. For example

constant int PI=3.14;

PI is the constant value , it cannot modify 

Constants has 2 type and that are user defined constant , pre-defined constant.