"Check if bits are SET in vba" Code Answer's
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Check if bits are SET in vba
'Fast VBA function to test if specific bits are set
'within a Byte. 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 7, so the first (least significant) bit
'is bit 0.
'Note: bits can be specified in any order.
Function ByteBitsAreSet(theByte As Byte, ParamArray bits()) As Boolean
Static i&, b() As Byte
If UBound(bits) = -1 Then Exit Function
If (Not Not b) = 0 Then
ReDim b(0 To 7)
For i = 0 To 7
b(i) = 2 ^ i
Next
End If
For i = 0 To UBound(bits)
If bits(i) < 0 Then Exit Function
If bits(i) > 7 Then Exit Function
If (theByte And b(Int(bits(i)))) = 0 Then Exit Function
Next
ByteBitsAreSet = True
End Function
'--------------------------------------------------------------------------
MsgBox ByteBitsAreSet(255, 7) '<--displays: True 255 = 11111111
MsgBox ByteBitsAreSet(230, 0) '<--displays: False 230 = 11100110
MsgBox ByteBitsAreSet(85, 0, 2, 6, 4) '<--displays: True 85 = 01010101
MsgBox ByteBitsAreSet(85, 0, 2, 5, 4) '<--displays: False 85 = 01010101
'
'
'
Source: academy.excelhero.com
excel vba is bit set long
'Extremely fast VBA function to test if a specified bit is set
'within a 32-bit Long integer.
'Bits are numbered from 0 to 31, so the first (least significant) bit
'is bit 0.
'Note: we do not inspect bit 31, the sign bit.
'Note: any number of bits can be specified in one call.
Function LongBitIsSet(theLong&, bit As Byte) As Boolean
Static i&, b&()
If (Not Not b) = 0 Then
ReDim b(0 To 30)
For i = 0 To 30
b(i) = 2 ^ i
Next
End If
If bit < 31 Then LongBitIsSet = theLong And b(bit)
End Function
'------------------------------------------------------------------
MsgBox LongBitIsSet(255, 7) '<--displays: True
MsgBox LongBitIsSet(230, 0) '<--displays: False
MsgBox LongBitIsSet(16384, 14) '<--displays: True
MsgBox LongBitIsSet(-16383, 0) '<--displays: True
MsgBox LongBitIsSet(&H7FFFFFFF, 0) '<--displays: True
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
excel vba set bit in byte
'Extremely fast VBA function to test if a specified bit is set
'within a Byte.
'Bits are numbered from 0 to 7, so the first (least significant) bit
'is bit 0.
Function ByteBitIsSet(theByte As Byte, bit As Byte) As Boolean
Static i&, b() As Byte
If (Not Not b) = 0 Then
ReDim b(0 To 7)
For i = 0 To 7
b(i) = 2 ^ i
Next
End If
If bit < 8 Then ByteBitIsSet = theByte And b(bit)
End Function
'------------------------------------------------------------------
MsgBox ByteBitIsSet(255, 7) '<--displays: True
MsgBox ByteBitIsSet(230, 0) '<--displays: False
Source: academy.excelhero.com
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