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 Home » Tip Bank » .NET » VB.NET » String Manipulation
Language: VB3, VB4, VB5, VB6
Expertise: Beginner
Aug 20, 2003

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# Return Roman Numerals

This VB procedure returns decimal numbers (integers) as Roman numerals (a string), ranging from 1 to 4999. Numbers outside this range return the same number as a string. The optional parameter iStyle allows two different numerical styles: standard (4 = iv, 9 = ix, and so on) when iStyle = -1, or classical (4 = iiii, 9 = viiii, and so on) when iStyle = -2.

The variable x should make the function more efficient, although you might not notice the time saved on a fast machine:

``````
Public Function Roman(ByVal n As Integer, _
Optional iStyle As Integer = -1) As String

If n < 1 Or n >= 5000 Then
Roman = CStr(n)
Exit Function
End If

If iStyle <> -2 Then iStyle = -1

Dim sRtn As String, i As Integer, x As Integer
Dim r(1 To 13) As String, v(1 To 13) As Integer

r(1) = "i": v(1) = 1
r(2) = "iv": v(2) = 4
r(3) = "v": v(3) = 5
r(4) = "ix": v(4) = 9
r(5) = "x": v(5) = 10
r(6) = "xl": v(6) = 40
r(7) = "l": v(7) = 50
r(8) = "xc": v(8) = 90
r(9) = "c": v(9) = 100
r(10) = "cd": v(10) = 400
r(11) = "d": v(11) = 500
r(12) = "cm": v(12) = 900
r(13) = "m": v(13) = 1000

x = UBound(v)
sRtn = ""
Do
For i = x To LBound(v) Step iStyle
If v(i) 7lt;= n Then
sRtn = sRtn & r(i)
n = n - v(i)
x = i
Exit For
End If
Next i
Loop Until n = 0

Roman = sRtn
End Function
``````
Steven Digby

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