A variable is a named memory location, which holds a data value of a particular data type.
The value of variable can be changed throughout the program.
Declaration of a variable:
Syntax:
data_type variable_name;Example:
int num;
double value;
float sum;Initialization of a variable:
Syntax:
data_type variable_name = value;Example:
int num = 5;
double value = 3.2;
float sum = 15.6;Variable Scope: Scope generally refer to the program region within which a variable is accessible.
The broad rule is a variable is accessible within the set of braces it is declared.
Syntax:
{
int num = 5;
...........
}