RosettaCodeData/Task/Binary-digits/VBA/binary-digits.vba

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Option Explicit
Sub Main_Dec2bin()
Dim Nb As Long
Nb = 5
Debug.Print "The decimal value " & Nb & " should produce an output of : " & DecToBin(Nb)
Debug.Print "The decimal value " & Nb & " should produce an output of : " & DecToBin2(Nb)
Nb = 50
Debug.Print "The decimal value " & Nb & " should produce an output of : " & DecToBin(Nb)
Debug.Print "The decimal value " & Nb & " should produce an output of : " & DecToBin2(Nb)
Nb = 9000
Debug.Print "The decimal value " & Nb & " should produce an output of : " & DecToBin(Nb)
Debug.Print "The decimal value " & Nb & " should produce an output of : " & DecToBin2(Nb)
End Sub
Function DecToBin(ByVal Number As Long) As String
Dim strTemp As String
Do While Number > 1
strTemp = Number - 2 * (Number \ 2) & strTemp
Number = Number \ 2
Loop
DecToBin = Number & strTemp
End Function
Function DecToBin2(ByVal Number As Long, Optional Places As Long) As String
If Number > 511 Then
DecToBin2 = "Error : Number is too large ! (Number must be < 511)"
ElseIf Number < -512 Then
DecToBin2 = "Error : Number is too small ! (Number must be > -512)"
Else
If Places = 0 Then
DecToBin2 = WorksheetFunction.Dec2Bin(Number)
Else
DecToBin2 = WorksheetFunction.Dec2Bin(Number, Places)
End If
End If
End Function