decimal/binary convert - repetition functions

[NooKzTeR]

im trying to make a binary/decimal convertor using repetition functions and no built in function. im having problems declaring the variables and using them in my algorithms. please help!!
--dec to bin--
set the bitstring to nothing
for each bit required in the bitstring
Calculate the remainder when the number is divided by 2
Number = Number \ 2 (integer division)
Bitstring = Remainder concatenated with the Bitstring
next bit
output the bitstring
--dec to bin--
set the bitstring to nothing
Do
Calculate the remainder when the number is divided by 2
Number = Number \ 2 (integer division)
Bitstring = Remainder concatenated with the Bitstring
loop until Number is zero
output the bitstring
--bin to dec--
Number = 0
for each character in the bitstring
Determine the value of the bit
Number = Number * 2 + Value of the bit
next character (moving rightwards through the bitstring)
output the Number

[Nucleus]

Here are two functions you can use:

Function BinToDec(ByVal BinString As Variant) As Double
 'Nucleus
 Dim BitValue As Double, LessABit As Double
 BinString = CDbl(BinString)
 BitValue = 1
 While BinString
    LessABit = BinString / 10
    If LessABit <> Int(LessABit) Then BinToDec = BitValue + BinToDec
    BitValue = BitValue * 2
    BinString = Int(LessABit)
 Wend
End Function

by Yonatan

Function Bin(ByVal X As Long) As String
    Do
        Bin = (X And 1) & Bin
        X = X \ 2
    Loop While X
End Function