by Anonymous (267 Submissions)
Category: Math/Dates
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Mon 6th February 2006
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Converts any number system into any number system, up to base 36. Ex: Base 2(binary) to Base 11(Undecimal), Base 10(decimal) to Base 13.
API Declarations
'Converts from number system into any number system.
' These functions can, for example, convert Base 2(binary) into base 13(tridecimal).
' It could also convert base 15 into base 3.
'
'Currently, the program IS case sensitive, so you could add abcdefg, etc, on to
' gcEQUIV_STRING to allow conversion to/from number systems higher than base 36.
' If you don't want it to be case sensitive, just add a few well-placed instances
' of UCASE() in the conversion functions.
'
'I couldn't find any code to do this, so I wrote my own.
'
'Feel free to use this. All I ask is that you give me credit.
'
'Enjoy!
'
'This string holds the characters we'll use for our number system conversions.
Global Const gcEQUIV_STRING = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
VBcoders
'This function just yanks the decimal equivalent of a character from gcEQUIV_STRING
NmbrSys_GetVal = InStr(1, gcEQUIV_STRING, myChar) - 1
End Function
Public Function NmbrSys_FromDecimal(ByVal myNumber As Currency, ByVal myBase As Byte, Optional ByVal myData As String = "") As String
'This is a recursive function that converts a number from decimal into a specified number system.
'Syntax: NmbrSys_FromDecimal(myNumber,myBase)
' Where myNumber is the decimal number to be converted, and myBase is
' the number system you want to convert into. myBase cannot be higher
' than the length of gcEQUIV_STRING. If you need to use a number system
' higher than base 36, you'll have to add new characters to gcEQUIV_STRING.
Dim myRemainder As Currency
If myNumber / myBase >= 1 Then
myRemainder = (myNumber Mod myBase)
myNumber = myNumber / myBase
If myNumber > myBase Then
myData = myData & NmbrSys_FromDecimal(Int(myNumber), myBase, myData) & Mid(gcEQUIV_STRING, myRemainder + 1, 1)
Else
myData = myData & Mid(gcEQUIV_STRING, Int(myNumber) + 1, 1)
myData = myData & Mid(gcEQUIV_STRING, myRemainder + 1, 1)
End If
Else
myData = myData & Mid(gcEQUIV_STRING, Int(myNumber) + 1, 1)
End If
NmbrSys_FromDecimal = myData
End Function
Public Function NmbrSys_ToDecimal(ByVal myData As String, ByVal myBase As Byte) As Currency
'Converts from any number system into base 10 (decimal).
'SYNTAX: NmbrSys_ToDecimal(myData,myBase)
' Where myData represents the number to be converted, and myBase represents which
' number system we're converting from.
Dim tmpNumber As Currency
For iPosition = 1 To Len(myData)
tmpNumber = tmpNumber + (NmbrSys_GetVal(Mid(myData, iPosition, 1)) * (myBase ^ (Len(myData) - iPosition)))
Next iPosition
NmbrSys_ToDecimal = tmpNumber
End Function
Public Function NmbrSys_Convert(ByVal myData As String, ByVal FromBase As Byte, ByVal ToBase As Byte) As String
'Converts from any number system into any number system, limited by the length
' of gcEQUIV_STRING, returning a string.
'SYNTAX: NmbrSys_Convert(myData,FromBase,ToBase)
' Where myData represents the number to be converted, FromBase represents
' which number system we're converting from, and ToBase represents which number
' system we are converting to.
Dim tmpNumber As Currency
Dim iPosition As Integer
Dim iCount As Integer
If FromBase <= Len(gcEQUIV_STRING) And ToBase <= Len(gcEQUIV_STRING) Then 'Check to see if we support the bases we received.
tmpNumber = NmbrSys_ToDecimal(myData, FromBase) 'Convert our number to decimal.
NmbrSys_Convert = NmbrSys_FromDecimal(tmpNumber, ToBase) 'Convert the decimal into the new number system.
Else
NmbrSys_Convert = myData 'If an unsupported base number was passed, return the data unscathed.
End If
End Function
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