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# Basic Constants

Constants used in Basic programs

## Boolean constants

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

## எடுத்துக்காட்டு:

    Dim bPositive as Boolean

    bPositive = True

## Mathematical constant

Name | Type | Value
Pi | Double | 3.14159265358979

## எடுத்துக்காட்டு:

    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.

## எடுத்துக்காட்டு:

    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