Modulus 10 in checksiffers

Do you make invoices in Domino? Then you might be interested in Checksiffers in CID. This code makes MOD10. 

Code: Function mod10(siffer As String) As String
	Dim lengde As Integer
	Dim strpos As Integer
	Dim felt As Integer
	Dim sifsum As Integer
	Dim pos As Integer
	Dim vekt As Integer
	strpos = Len(siffer)
	vekt = 2
	pos = 0
	While strpos > 0
		felt = Cint(Mid(siffer,strpos,1))
		strpos = strpos - 1
		sifsum = sifsum + Cint(Mid(Cstr(felt*vekt),1,1)) + Cint("0" & (Mid(Cstr(felt*vekt),2,1)))
		If vekt = 2 Then
			vekt = 1
		Else
			vekt = 2
		End If
	Wend
	mod10 = Cstr(10 - Right(sifsum,1))
	If mod10 = Cstr(10) Then
		mod10 = "0"
	End If
End Function

This was first published in January 2001

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