Variable types[Java]

[bl4ck]

Variable types in Java​

Hello Everyone

This is my first tutorial in java on cybertech

I'm this short tutorial I'm going to explain Java Variable types

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What is a variable :

Variables are places in the computer's memory where you store the data for a program. Each variable is given a unique name which you refer to it with.


Variable types :


There are 3 different types of data that can be stored in variables. The first type is the numeric type which stores numbers. There are 2 types of numeric variables which are integer and real. Integers are whole numbers such as 1,2,3,... Real numbers have a decimal point in them such as 1.89 or 0.12.

Character variables store only 1 letter of the alphabet. You must always put the vlaue that is to be stored in a character variable inside single quotes. A string variable is like a chracter variable but it can store more than 1 character in it. You must use double quotes for a string instead of single quotes like with a character.

Boolean variables can store 1 of 2 values which are True or False.

Here is a table of the types of variables that can be used:

 -Name -            -Type-                     -Vaules-   
byte  	        Numeric - Integer	-128 to 127
short   	Numeric - Integer	-32 768 to 32 767
int	        Numeric - Integer	-2 147 483 648 to 2 147 483 647
long	        Numeric - Integer	-9 223 372 036 854 775 808 to 9 223 372 036 854 775 807
float	        Numeric - Real	        -3.4 * 1038 to 3.4 * 1038
double	        Numeric - Real	        -1.7 * 10308 to 1.7 * 10308
char	        Character	        All unicode characters
String	        Character	        All unicode characters
boolean	        Boolean	                True or False

If you have any question feel free to ask

:bye:

 

[OliverE]

Thanks, this is very useful.
Alot of people get confused by the differences between all the differnet numeric types.
Note: Doubles allow more precision than floats