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# 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

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
vbTrue | -1 | Part of vbTriState enumeration.
vbFalse | 0 | Part of vbTriState enumeration.
vbUseDefault | -2 | Part of vbTriState enumeration.
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