Decimal to binary conversion for large numbers in Excel

Question

I have some large numbers in an Excel sheet and I want to convert them to binary.

e.g.

12345678  
965321458  
-12457896

Answer 1

While I didn't write this for negatives or decimals, it should be relatively easy to modify. This VBA will convert any super large (or not so large if you want, but that wasn't the point) decimal up to the converted binary result containing up to 32767 digits (maximum string length in VBA).

Enter decimal in cell "A1" as a string, result will be in "B1" as a string.

Dim NBN As String

Dim Bin As String

5 Big = Range("A1")

AA = Len(Big)

For XX = 1 To AA

L1 = Mid(Big, XX, 1) + CRY

CRY = 0

If L1 = 0 Then

FN = "0"

GoTo 10

End If

If Int(L1 / 2) = L1 / 2 Then

FN = L1 / 2

GoTo 10

End If

If Int(L1 / 2) <> L1 / 2 Then

FN = Int(L1 / 2)

CRY = 10

GoTo 10

End If

10 NBN = NBN & FN

Next XX

If Left(NBN, 1) = "0" Then

NBN = Right(NBN, (Len(NBN) - 1))

End If

If CRY = 10 Then Bin = "1" & Bin Else Bin = "0" & Bin

Range("A1") = NBN

Range("A2") = Bin

If Len(NBN) > 0 Then

NBN = ""

CRY = 0

GoTo 5

End If