例: Log function

例 1

Dim natLog As Double
natLog# = Log(18)               ' Assigns 2.89037175789617

例 2

' Compute the base 10 logarithm of a number.
Function Log10 (inVal As Single) As Single  
   Log10 = Log(inVal!) / Log(10)
End Function
Print Log10(10)                 ' Output:  1
Print Log10(100)                ' Output:  2
Print Log10(1 / 100)            ' Output:  -2
Print Log10(1)                  ' Output:  0