AAAH!!! i'm running out of time!!!

ok so i have this...

VB Code:

Option Explicit
Dim strNewNum As String
 
Function DecimalToBinary(ByVal lngBin As Long, lngDesc As Long) As Long
    Dim intNum As Integer
    
    Dim lngBinary2 As Long
    Dim lngDecimal As Long
    Dim lngStepping As Long
    Dim strDigit As String
    
    
    intNum = txtNum.Text
    lngStepping = 1
    
    Do Until intNum \ lngStepping = 1
        lngStepping = lngStepping * 2
    Loop
    Do Until intNum <= 0
        strDigit = intNum \ lngStepping
        strNewNum = strNewNum & strDigit
        intNum = intNum Mod lngStepping
        lngStepping = lngStepping / 2
    Loop
End Function
 
Private Sub cmdBtoD_Click()
    
End Sub
 
Private Sub cmdDone_Click()
    Unload Me
End Sub
 
Private Sub cmdDtoB_Click()
    Dim lngBinary As Long
    lngBinary = DecimalToBinary(1, 65000)
    MsgBox (strNewNum)
End Sub

it all works...

now how do you convert the binary back to decimal? (no case plz i havn't learned them)

Each digit in a binary value represents a power of 2, starting with 2^0 for the first (right-most) binary digit, 2^1 for the second digit, and so on. Note that any number to the 0 power is by definition 1, and any number to the 1 power is the number itself. Using 1101 for another example, you have:

The first digit is 1, and 1 times 2^0 is 1.
The second digit is 0, and 0 times 2^1 is 0.
The third digit is 1, and 1 times 2^2 is 4.
The fourth digit is 1, and 1 times 2^3 is 8.
8 + 4 + 1 equals 13.

A function to perform the binary to decimal conversion is shown here.

VB Code:

Public Function BinaryToDecimal(BinaryValue As String) As Long
 
 ' Returns the decimal equivalent of a binary number.
 
Dim idx As Integer
Dim tmp As String
Dim result As Long
Dim digits As Integer
 
digits = Len(BinaryValue)
For idx = digits To 1 Step -1
    tmp = Mid(BinaryValue, idx, 1)
    If tmp = "1" Then result = result + 2 ^ (digits - idx)
Next
 
BinaryToDecimal = result
 
End Function

This function treats any character other than "1" in the binary value as a "0". You might want to add error-schecking code to ensure that the binary value contains only "0" and "1" characters.

http://www.vbforums.com/showthread.p...hreadid=238674

ok here is what i have

VB Code:

Function BinaryToDecimal(ByVal lngBin As Long, ByVal lngDesc As Long) As Long
    Dim strNum As String
    Dim lngNum As Long
    Dim lngCounter As Long
    
    strNum = txtNum.Text
    
    lngCounter = Len(strNum)
    
    
    
    Do Until lngCounter = 0
        lngNum = 2 ^ lngCounter
        strDecimal = strDecimal & lngNum
        lngCounter = lngCounter - 1
    Loop
    
End Function

now for some reason th emsg box comes back as (say if the decimal number is 513... converts it into 1000000001 the msg box will come back as 1024512256128643216842) how can i add thos enumbers without converting it into a long??? or do i have to?

VB Code:

Function BinaryToDecimal(ByVal strBin As String) As Long
    Dim strNum As String
    Dim lngNum As Long
    Dim lngCounter As Long
    Dim lngHelper As Long
    
    strNum = txtNum.Text
    
    lngCounter = Len(strNum) - 1
        
    Do Until lngCounter < 0
        lngNum = 2 ^ lngCounter
        lngHelper = lngHelper + lngNum
        lngCounter = lngCounter - 1
        strDecimal = lngHelper
    Loop
    
End Function

ok now it says if i convert 513 to binary and then i convert it back... i get an answer of 1023... help??? (i can't dl zip files on my school computer)

Input binary and output binary ought to be stored as a string.

Given 10110101, StrReverse the string so you go left to right (1 to Len())

VB Code:

Option Explicit
 
Private Sub Command1_Click()
   Text2.Text = BinaryToDecimal(Text1.Text)
End Sub
 
Private Sub Command2_Click()
   Text3.Text = DecimalToBinary(Val(Text2.Text))
End Sub
 
Public Function BinaryToDecimal(strInputBits As String) As Long
Dim strRevBinaryBits As String
Dim lngDecimal As Long
Dim lngX As Long
 
   strRevBinaryBits = StrReverse(strInputBits)
   lngDecimal = 0
   For lngX = 1 To Len(strRevBinaryBits)
      If Val(Mid(strRevBinaryBits, lngX, 1)) > 0 Then
         lngDecimal = lngDecimal + 2 ^ (lngX - 1)
      End If
   Next
   
   BinaryToDecimal = lngDecimal
End Function
 
Public Function DecimalToBinary(lngInputLong As Long) As String
Dim strTempBits As String
 
   strTempBits = ""
   Do While lngInputLong > 0
      strTempBits = strTempBits & (lngInputLong Mod 2)
      lngInputLong = lngInputLong \ 2
   Loop
   
   DecimalToBinary = StrReverse(strTempBits)
End Function

Just in case...

VB Code:

Public Function EnsureBinaryString(strInput As String) As String
Dim lngX As Long
Dim strTemp As String
 
   strTemp = ""
   For lngX = 1 To Len(strInput)
      If Mid(strInput, lngX, 1) = "1" Or Mid(strInput, lngX, 1) = "0" Then
         strTemp = strTemp & Mid(strInput, lngX, 1)
      End If
   Next
   
   EnsureBinaryString = strTemp
End Function