Basic Constants

Constants used in Basic programs

Boolean constants

Name

Type

Value

True

Boolean

1

False

Boolean

0


Example:

Dim bPositive as Boolean

bPositive = True

Mathematical constant

Name

Type

Value

Pi

Double

3.14159265358979


Example:

Function Rad2Deg( aRad as Double) As Double

 Rad2Deg = aRad * 180.00 / Pi

End Function

Object Constants

Name

Type

Usage

Empty

Variant

The Empty value indicates that the variable is not initialized.

Null

null

Indicates that the variable does not contain data.

Nothing

Object

Assign the Nothing object to a variable to remove a previous assignment.


Example:

SubExampleEmpty

Dim sVar As Variant

 sVar = Empty

 Print IsEmpty(sVar) ' Returns True

End Sub

Sub ExampleNull

Dim vVar As Variant

 MsgBox IsNull(vVar)

End Sub

Sub ExampleNothing

Dim oDoc As Object

 Set oDoc = ThisComponent

 Print oDoc.Title

 oDoc = Nothing

 Print oDoc ‘ Error

End Sub

Additional VBA constants

The following constants are available when VBA compatibility mode is enabled

Тасвири Огоҳикунанда

This function or constant is enabled with the statement Option VBASupport 1 placed before the executable program code in a module.


Named constant

Hexadecimal (decimal) value

Description

vbCr

\x0D (13)

CR - Carriage return

vbCrLf

\x0D\x0A (13 10)

CRLF - Carriage return and line feed

vbFormFeed

\x0c (12)

FF - Form feed

vbLf

\x0A (10)

LF - Line feed

vbNewLine

\x0D\x0A (13 10) for 32-bit Windows

\x0A (10) for other 64-bit systems

LF or CRLF

vbNullString

""

Null string

vbTab

\x09 (9)

HT - Horizontal tab

vbVerticalTab

\x0B (11)

VT - Vertical tab