Data Types

Integer
whole numbers (1,2,3,-4)
(includes natural numbers)
examples: age numbers of pets

Single
decimal numbers (0.5, 10.23)
real numbers (can include rational numbers)
used for: Average, measurement

Char
a single character (a, A, C, £)
any letter, number or symbol

String
a series of characters
can be Alphanumeric (numbers, letter and symbols)
example: Bob, FX01IZZ
used for peoples names, car reg

Boolean
can hold one of two values 
is either true or false

Short
A short integer
holds whole number values 
within a limited range -32, 768 + 32, 767
useful to use to save on memory
use and save on storage space

Double
stores larger decimal place numbers and also larger integer values
not necessary unless the answer goes into billions/trillions