The table below shows the different types of variables available in QBasic:

Data Types	Suffix
Single-precision	!
Integer	%
Double-precision	#
Long-integer	&
String	$

• The first 4 types are used to store numbers:
  • The Single-precision and double-precision types store floating point numbers. (ie: 45.68474, 38389.3946)
  • The integer and long-integer types store integers, or numbers without decimal points. (ie: 40, 2, 345678)
• The String variables store characters, letters, texts, sentences. (ie: "Hello!")
• If no suffix is assigned, a variable is automatically classified by QB as single-precision.

Data are stored in memory variables, or constants. In QBasic variables should respect the following rules:

• The length should not be greater than 40 characters
• They should start with a letter
• They should not contain spaces
• They do not support certain characters such as (