Solved

Scientific Number Conversions

Posted on 1998-07-27
2
444 Views
Last Modified: 2010-08-05
I need to convert a hex, octal, or binary number to DECIMAL.  How can I do this?  I know about the Hex and Oct functions, and can figure out decimal to binary, I just don't know how to get the number (string) back to decimal.  Also, if anyone has sample code for creating a scientific calculator (specifically the number conversions), I'd REALLY like to see it (and I'd pay extra points).
0
Comment
Question by:regent
2 Comments
 

Expert Comment

by:abrooke
Comment Utility
This is the source I use to convert a hex stored as a string to a decimal long. How it's done: I iterate through the HexNumber from left to right each place has a value of 16^(total length minus current position in strength) I multiply this value times the actual value of the place 0-15. Add up the values and return the sum.

                                       Lonnie Brooke

Public Function HexToDecimal(HexNumber As String) As Long
   Dim tmpAr() As Byte
   Dim i&, j&, k&, t&, r&
   Dim l$, m$
   
   i = Len(HexNumber)
   ReDim tmpAr(i) As Byte
   j = 1
   k = i - 1
   While j < i + 1
      t = Asc(Mid(HexNumber, j, 1))
      Select Case t
         Case 65 To 70
            t = t - 55
         Case 48 To 57
            t = t - 48
      End Select
      r = r + ((16 ^ k) * t)
      k = k - 1
      j = j + 1
   Wend
   
   HexToDecimal = r
   
End Function

0
 
LVL 6

Accepted Solution

by:
alamo earned 100 total points
Comment Utility
The following function will convert a string representing a number in any base (2 through 36) to decimal. It handles illegal characters like Val(), by stopping the conversion.

Public Function ConvertToDecimal(sNumber As String, iBase As Integer) As Long
Dim lResult As Long
Dim i, iChar As Integer

    For i = 1 To Len(sNumber)
        iChar = Asc(UCase$(Mid$(sNumber, i, 1))) - 48
        If iChar > 9 Then iChar = iChar - 7
        If iChar < 0 Or iChar >= iBase Then Exit For 'invalid character
        lResult = lResult * iBase + iChar
    Next
    ConvertToDecimal = lResult
End Function

Hope this helps!
0

Featured Post

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

When designing a form there are several BorderStyles to choose from, all of which can be classified as either 'Fixed' or 'Sizable' and I'd guess that 'Fixed Single' or one of the other fixed types is the most popular choice. I assume it's the most p…
You can of course define an array to hold data that is of a particular type like an array of Strings to hold customer names or an array of Doubles to hold customer sales, but what do you do if you want to coordinate that data? This article describes…
As developers, we are not limited to the functions provided by the VBA language. In addition, we can call the functions that are part of the Windows operating system. These functions are part of the Windows API (Application Programming Interface). U…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…

763 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

6 Experts available now in Live!

Get 1:1 Help Now