byte manipulation..

[Raph]

For example I want to invert the 1st, 3rd, 5th and 7th bit of this byte 01010101 the resulting byte must be 11111111 since the 1st, 3rd, 5th and 7th bit has been inverted..

I've already seen this code provided by yytsunamiyy but it seems like there is a problem with the code. Here is the code that he had worked on:

from (http://www.mrexcel.com/forum/showthread.php?t=482910)

Code:

Public Function INVERTBITS(Source As Range, bits_to_invert As String) As String
Dim i As Integer
Dim store As String, x as string

For i = 1 To Len(Source.Value)
x = i

If InStr(bits_to_invert, x) > 0 Then
If Mid(Source.Value, i, 1) = "0" Then
store = store & "1"
Else
store = store & "0"

End If
Else
store = store & Mid(Source.Value, i, 1)
On Error GoTo 0
End If

Next i
INVERTBITS = store

End Function


And here is how it should work:

Usage:

Source-Byte Result Formula in B
110 011 =INVERTBITS(A2;"13")
010 111 =INVERTBITS(A3;"13")
11111111 01010101 =INVERTBITS(A4;"1357")


I need all of your help, thanks..

 

[Andrew Poulsom]

Welcome to the Board. Your formulas worked for me:

<TABLE style="WIDTH: 215pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=286 x:str><COLGROUP><COL style="WIDTH: 48pt" span=2 width=64><COL style="WIDTH: 119pt; mso-width-source: userset; mso-width-alt: 5778" width=158><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; WIDTH: 48pt; HEIGHT: 12.75pt; BORDER-TOP: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid" class=xl22 height=17 width=64>110011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; WIDTH: 48pt; BORDER-TOP: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid" class=xl23 width=64>011011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; WIDTH: 119pt; BORDER-TOP: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid" class=xl22 width=158>=INVERTBITS(A2,"13")</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl22 height=17>010111</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl23>111111</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl22>=INVERTBITS(A3,"13")</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl22 height=17>01010101</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl23>11111111</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl22>=INVERTBITS(A4,"1357")</TD></TR></TBODY></TABLE>

Make sure that the cells in column A are formatted as Text before you enter the numbers. You can't format the cells as eg 00000000 and enter them, because any leading zeroes will be ignored.

 

[Raph]

Sir Andrew I've already determined the problem. Mr. yytsunamiyy used a semicolon instead of a comma (; instead of ,)
wrong = (A2;"13")
correct = (A2,"13")

Thank you for your time Sir and the tip about the format as text. Thanks.