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Conversion Routines

Posted on 2001-08-27
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Last Modified: 2012-06-27
Hi all,

Does anybody out there have conversion routines for the following.

Decimal to Binary
Binary to Decimal

Vin.  
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Question by:VincentLawlor
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6 Comments
 
LVL 22

Accepted Solution

by:
ture earned 50 total points
ID: 6427964
Vin,

I'm sure that there must be better solutions around, but I post this one anyway.

Function DecToBin(d As Long) As String
  Dim x As Integer
  Dim b As String
 
  Do
    If d And 2 ^ x Then
      b = "1" & b
    Else
      b = "0" & b
    End If
    x = x + 1
  Loop Until 2 ^ x > d

  DecToBin = b
End Function

Function BinToDec(b As String) As Long
  Dim x As Integer
  Dim d As Long
 
  For x = 1 To Len(b)
    If Mid(Right(b, x), 1, 1) = "1" Then
      d = d + 2 ^ (x - 1)
    End If
  Next x
 
  BinToDec = d
End Function

Ture Magnusson
Karlstad, Sweden
0
 
LVL 4

Author Comment

by:VincentLawlor
ID: 6427985
That will do the job

Just couldn't remember the twos compliment routines and I'm in a bit of a hurry.

Thanks.

Vin.
0
 
LVL 22

Expert Comment

by:ture
ID: 6428011
Thanks for the points, Vin! I'm glad that I could help you!

/Ture
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LVL 4

Author Comment

by:VincentLawlor
ID: 6428075
Don't suppose you have hex routines of a similar nature

The VB Hex function works fine but if I try to convert a Hex value

Function ConvertHexToDec(strHex as String) as Long

dim strValue as String
dim iTemp as Integer
strValue = "&H" + strHex

ConvertHexToDec = Val(strValue)

Exit Function

I get -1 not 65535 as expected for FFFF

Any ideas

Vin.




 
0
 
LVL 4

Author Comment

by:VincentLawlor
ID: 6428292
I have the Hex to decimal function

Function HexToDec(strInput As String) As Variant

    Dim iCounter As Integer
    iCounter = 0
    Dim lResult
    lResult = 0
    Dim radix As Integer
    radix = 16
    For iCounter = 1 To Len(strInput)
        lResult = lResult * radix
        If Asc(Mid(strInput, iCounter)) >= 48 And Asc(Mid(strInput, iCounter)) <= 57 Then
            lResult = lResult + (Asc(Mid(strInput, iCounter)) - 48)
        Else
            lResult = lResult + (Asc(UCase(Mid(strInput, iCounter))) - 65) + 10
        End If
       
    Next iCounter
         
    HexToDec = lResult

End Function

Do you by any chance have a DecToHex function the VB one only works up to ffffffff

Vin.
0
 
LVL 22

Expert Comment

by:ture
ID: 6428452
Vin,

There's really no need for a DecToHex function, because there is already a HEX function that converts a number to hex. In this code I've "encapsuled" it within a custom function named DecToHex.

Function DecToHex(d As Long) As String
  DecToHex = Hex(d)
End Function


It is also easy to convert hext to decimal. Just precede the hex number with "&H" and use VB's CDbl conversion function.

Function HexToDec(h As String) As Long
  HexToDec = CDbl("&H" & h)
End Function

/Ture
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