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Tip of the Day
Language: VB4,VB5,VB6,VBS
Expertise: Intermediate
Jun 26, 1999



Building the Right Environment to Support AI, Machine Learning and Deep Learning

RotateRightI - Rotate an Integer to the right

' Rotate an Integer to the right the specified number of times
' NOTE: requires Power2()

Function RotateRightI(ByVal value As Integer, ByVal times As Long) As Integer
    Dim i As Long, signBits As Integer
    ' no need to rotate more times than required
    times = times Mod 16
    ' return the number if it's a multiple of 16
    If times = 0 Then RotateRightI = value: Exit Function
    For i = 1 To times
        ' remember the sign bit and bit 0
        signBits = value And &H8001
        ' clear those bits and shift to the right by one position
        value = (value And &H7FFE) \ 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 &H4000) Or (CBool(signBits And 1) _
            And &H8000)
    RotateRightI = value
End Function
Francesco Balena
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