Variables store data for processing.
A variable is given a name (or identifier), such as area, age, height, and the like. The name uniquely identifies each variable, assigning a value to the variable and retrieving the value stored.
Variables have types. Some examples:
– int: for integers (whole numbers) such as 123 and -456
– double: for floating-point or real numbers with optional decimal points and fractional parts in fixed or scientific notations, such as 3.1416, -55.66.
– String: for texts such as “Hello” or “Good Morning!”. Text strings are enclosed within double quotes.
You can declare a variable of a type and assign it a value. Example:
String name = “Jason”;
This creates a variable called name of type String, and assigns it the value “Jason”.
You can use a comma-separated list to declare more than one variable of the specified type. Example:
int a = 42, b = 11;
Array : a collection of variables of the same type