' Visual Basic 2008 9.0 .NET Examples - Methods and Arguments - Procedures and Functions : 
Module Example3
    Sub Main()
        Console.WriteLine(GetPower(3, 3))
        Console.WriteLine(GetPower(3))                                     ' (1)
        '
        Console.ReadLine()
    End Sub
    Function GetPower(ByVal base As Integer, _
                      Optional ByVal exponent As Integer = 2) As Integer
        GetPower = base ^ exponent
    End Function
End Module
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