Binaryworld - RotateRight - Rotate a Long to the right ... [ VB -> Math ]

' Rotate a Long to the right the specified number of times
'
' NOTE: requires Power2()

Function RotateRight(ByVal value As Long, ByVal times As Long) As Long
  Dim i As Long, signBits As Long

  ' no need to rotate more times than required
  times = times Mod 32
  ' return the number if it's a multiple of 32
  If times = 0 Then RotateRight = value: Exit Function

  For i = 1 To times
    ' remember the sign bit and bit 0
    signBits = value And &H80000001
    ' clear those bits and shift to the right by one position
    value = (value And &H7FFFFFFE) \ 2
    ' if the number was negative, then re-insert the bit
    ' if bit 0 was set, then set the sign bit
    value = value Or ((signBits < 0) And &H40000000) Or (CBool(signBits And _
      1) And &H80000000)
  Next
  RotateRight = value
End Function