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excel vba bitshift left
“excel vba bitshift left” Code Answer
excel vba bitshift left
vb by
Excel Hero
on May 25 2020
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'Many programming languages have a bitwise left-shift operator: << 'VBA does not. However, it can be emulated in a performant function: Function ShiftLeft1&(ByVal n&) ShiftLeft1 = 2& * (n And 1073741823): If n And 1073741824 Then ShiftLeft1 = ShiftLeft1 Or &H80000000 End Function MsgBox ShiftLeft1(170) '<--displays 340 1 left-shift (170 << 1) = 340 '------------------------------------------------------------------------------------------------------- Function ShiftLeft2&(ByVal n&) ShiftLeft2 = 4& * (n And 536870911): If n And 536870912 Then ShiftLeft2 = ShiftLeft2 Or &H80000000 End Function MsgBox ShiftLeft2(170) '<--displays 680 2 left-shift3 (170 << 2) = 680 '------------------------------------------------------------------------------------------------------- Function ShiftLeft3&(ByVal n&) ShiftLeft3 = 8& * (n And 268435455): If n And 268435456 Then ShiftLeft3 = ShiftLeft3 Or &H80000000 End Function MsgBox ShiftLeft3(170) '<--displays 1360 3 left-shifts (170 << 3) = 1360 '------------------------------------------------------------------------------------------------------- Function ShiftLeft4&(ByVal n&) ShiftLeft4 = 16& * (n And 134217727): If n And 134217728 Then ShiftLeft4 = ShiftLeft4 Or &H80000000 End Function MsgBox ShiftLeft4(170) '<--displays 2720 4 left-shifts (170 << 4) = 2720 'NB: Thses function are extremely fast. But they are hard-coded for predefined number of place shifts. ' Here is a generic function that handles all 31 possible place shifts: Function ShiftLeft&(ByVal n&, Optional ByVal shifts& = 1) Dim d& Select Case shifts Case 1: d = 2& * (n And 1073741823): If n And 1073741824 Then d = d Or &H80000000 Case 2: d = 4& * (n And 536870911): If n And 536870912 Then d = d Or &H80000000 Case 3: d = 8& * (n And 268435455): If n And 268435456 Then d = d Or &H80000000 Case 4: d = 16& * (n And 134217727): If n And 134217728 Then d = d Or &H80000000 Case 5: d = 32& * (n And 67108863): If n And 67108864 Then d = d Or &H80000000 Case 6: d = 64& * (n And 33554431): If n And 33554432 Then d = d Or &H80000000 Case 7: d = 128& * (n And 16777215): If n And 16777216 Then d = d Or &H80000000 Case 8: d = 256& * (n And 8388607): If n And 8388608 Then d = d Or &H80000000 Case 9: d = 512& * (n And 4194303): If n And 4194304 Then d = d Or &H80000000 Case 10: d = 1024& * (n And 2097151): If n And 2097152 Then d = d Or &H80000000 Case 11: d = 2048& * (n And 1048575): If n And 1048576 Then d = d Or &H80000000 Case 12: d = 4096& * (n And 524287): If n And 524288 Then d = d Or &H80000000 Case 13: d = 8192& * (n And 262143): If n And 262144 Then d = d Or &H80000000 Case 14: d = 16384& * (n And 131071): If n And 131072 Then d = d Or &H80000000 Case 15: d = 32768 * (n And 65535): If n And 65536 Then d = d Or &H80000000 Case 16: d = 65536 * (n And 32767&): If n And 32768 Then d = d Or &H80000000 Case 17: d = 131072 * (n And 16383&): If n And 16384& Then d = d Or &H80000000 Case 18: d = 262144 * (n And 8191&): If n And 8192& Then d = d Or &H80000000 Case 19: d = 524288 * (n And 4095&): If n And 4096& Then d = d Or &H80000000 Case 20: d = 1048576 * (n And 2047&): If n And 2048& Then d = d Or &H80000000 Case 21: d = 2097152 * (n And 1023&): If n And 1024& Then d = d Or &H80000000 Case 22: d = 4194304 * (n And 511&): If n And 512& Then d = d Or &H80000000 Case 23: d = 8388608 * (n And 255&): If n And 256& Then d = d Or &H80000000 Case 24: d = 16777216 * (n And 127&): If n And 128& Then d = d Or &H80000000 Case 25: d = 33554432 * (n And 63&): If n And 64& Then d = d Or &H80000000 Case 26: d = 67108864 * (n And 31&): If n And 32& Then d = d Or &H80000000 Case 27: d = 134217728 * (n And 15&): If n And 16& Then d = d Or &H80000000 Case 28: d = 268435456 * (n And 7&): If n And 8& Then d = d Or &H80000000 Case 29: d = 536870912 * (n And 3&): If n And 4& Then d = d Or &H80000000 Case 30: d = 1073741824 * (n And 1&): If n And 2& Then d = d Or &H80000000 Case 31: If n And &H1& Then d = &H80000000 Else d = &H0& Case 0: d = n End Select ShiftLeft = d End Function MsgBox ShiftLeft(1, 24) '<--displays 16777216 24 left-shifts (1 << 24) = 16777216 'NB: Remember that VBA Longs are signed.
Source:
academy.excelhero.com
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