Modul
Innhold
Innholdsliste 🔎︎

# Basic Constants

Constants used in Basic programs

## Boolean constants

Name | Type | Value
True | Boolean | 1
False | Boolean | 0

## Eksempel:

            Dim bPositive as Boolean
            bPositive = True

## Mathematical constant

Name | Type | Value
Pi | Double | 3.14159265358979

## Eksempel:

            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.

## Eksempel:

            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

Denne funksjonen er slått på med uttrykket Option VBASupport 1 satt foran den kjørbare programkoden i en modul.

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