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Variables

Variables are like containers that hold a value.

The type of value is the DataType

DataType

  • Number
  • Character (ie. 'a', 'b', 'c', etc...)
  • Array (Special)
  • Boolean

Number

As simple as it sounds, a number can have many different datatypes.

  • float or double are decimal-point numbers, difference is in its accuracy (@advanced: how does a computer store numbers & therefore whats the difference between the 2?)
  • int is used to store a whole number (@advanced: does it always store in base 10?)

Characters

Characters refer to a single, ONE letter.

Of course 1 letter is pretty useless unless it can be used as a String.

A String is an array of characters, allowing multiple characters to be stored in 1 vairable, that is a String.

Array

An array is a special data type, it is able to store multiple variables in 1 variable. (re-read that to take it in).

Boolean

A boolean is a variable that only have 2 states: - 1 or 0 - True or False. - Yes or No

It is usually a DataType of its own in MOST high level programming langauges.

Advanced

(@advanced) Primitive vs Derived DataTypes: Derived DataTypes are when a programmer defines their own Datatype using the primitive ones (@google)