Basic Constants
Constants used in Basic programs
Boolean constants
Name |
Type |
Value |
True |
Boolean |
1 |
False |
Boolean |
0 |
Dim bPositive as Boolean
bPositive = True
Mathematical constant
Name |
Type |
Value |
Pi |
Double |
3.14159265358979 |
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. |
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
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 |