Boolean

The Boolean data type can store the two Boolean values "true" and "false." The Boolean data type is primarily used in conditional statements such as If or While , since the comparison operators (such as < or = ) result in a Boolean value. For example, in the following function, the Negative local variable determines what is printed.

Table 3-1. Fundamental Types

Type	Description
Boolean	A Boolean (true/false) value
Byte	A 1-byte unsigned integer
Short	A 2-byte signed integer
Integer	A 4-byte signed integer
Long	An 8-byte signed integer
Decimal	A 16-byte scaled decimal number
Single	A 4-byte single precision floating-point number
Double	An 8-byte double precision floating-point number
Date	A time/date value
Char	A single Unicode character
String	A string of Unicode characters

 Dim a As Integer Dim Negative As Boolean a = 10 - 20 Negative = a < 0 If Negative Then   Console.WriteLine("Less than zero.") Else   Console.WriteLine("Greater than or equal to zero.") End If 

The Boolean values "true" and "false" are represented by the literals True and False , respectively. The default value of Boolean is the literal False .