例: Abs function

Print Abs(12)                         ' Prints 12
Print Abs(-12)                        ' Prints 12
Print Abs(13 - 25)                    ' Prints 12
Print TypeName(Abs(-12))              ' Prints INTEGER

Dim someV As Variant
someV = "123"
Print Abs(someV)                      ' Prints 123 
someV = NULL
Print Abs(someV)                      ' Prints #NULL#