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excel vba test if specific bits set in integer
'Fast VBA function to test if specific bits are set
'within a 16-bit Integer. If ALL specified bits are set then
'this function returns True. If ANY of the specified bits are
'not set then this function returns False.
'Bits are numbered from 0 to 15, so the first (least significant) bit
'is bit 0.
'Note: bits can be specified in any order.
'Note: any number of bits can be specified in one call.
Function IntegerBitsAreSet(theInteger%, ParamArray bits()) As Boolean
Static i&, b%()
If UBound(bits) = -1 Then Exit Function
If (Not Not b) = 0 Then
ReDim b(0 To 14)
For i = 0 To 14
b(i) = 2 ^ i
Next
End If
For i = 0 To UBound(bits)
If bits(i) < 0 Then Exit Function
If bits(i) > 14 Then Exit Function
If (theInteger And b(Int(bits(i)))) = 0 Then Exit Function
Next
IntegerBitsAreSet = True
End Function
'----------------------------------------------------------------------------------------
MsgBox IntegerBitsAreSet(255, 7) '<--displays: True 255 = 00000000 11111111
MsgBox IntegerBitsAreSet(230, 0) '<--displays: False 230 = 00000000 11100110
MsgBox IntegerBitsAreSet(85, 0, 2, 6, 4) '<--displays: True 85 = 00000000 01010101
MsgBox IntegerBitsAreSet(85, 0, 2, 5, 4) '<--displays: False 85 = 00000000 01010101
MsgBox IntegerBitsAreSet(485, 2, 7, 5) '<--displays: True 485 = 00000001 11100101
MsgBox IntegerBitsAreSet(24585, 14, 13, 3) '<--displays: True 24585 = 01100000 00001001
'
'
'
Source: academy.excelhero.com
excel vba check if bit is set in integer
'Extremely fast VBA function to test if a specified bit is set
'within a 16-bit Integer.
'Bits are numbered from 0 to 15, so the first (least significant) bit
'is bit 0.
'Note: we do not inspect bit 15, the sign bit.
Function IntegerBitIsSet(theInteger%, bit As Byte) As Boolean
Static i&, b%()
If (Not Not b) = 0 Then
ReDim b(0 To 14)
For i = 0 To 14
b(i) = 2 ^ i
Next
End If
If bit < 15 Then IntegerBitIsSet = theInteger And b(bit)
End Function
'------------------------------------------------------------------
MsgBox IntegerBitIsSet(255, 7) '<--displays: True
MsgBox IntegerBitIsSet(230, 0) '<--displays: False
MsgBox IntegerBitIsSet(16384, 14) '<--displays: True
MsgBox IntegerBitIsSet(-16383, 0) '<--displays: True
Source: academy.excelhero.com
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