Decimal To Roman Converter
This code takes an input decimal number and converts it to roman numerals. Will work for any number inputted until the output string becomes too big (and testing seems to show this doesnt actuually happen)! This is the shortest piece of code to o this (to my knowledge), as all the others I've seen are useless....
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Const sMatrix As String = "I~V~X~L~C~D~M"
Private Function ToRoman(ByVal sDecNum As String) As String
If sDecNum <> "0" And sDecNum <> vbNullString Then
Dim sNumArray() As String
If Len(sDecNum) > 3 Then ToRoman = String(Mid(sDecNum, 1, Len(sDecNum) - 3), "M")
If Len(sDecNum) > 2 Then ToRoman = ToRoman & GiveLetters(Mid(sDecNum, Len(sDecNum) - 2, 1), 4)
If Len(sDecNum) > 1 Then ToRoman = ToRoman & GiveLetters(Mid(sDecNum, Len(sDecNum) - 1, 1), 2)
ToRoman = ToRoman & GiveLetters(Mid(sDecNum, Len(sDecNum), 1), 0)
Else: ToRoman = "No Roman value for 0"
End If
End Function
Private Function GiveLetters(ByVal sInput As String, ByVal iArrStart As Integer) As String
Dim sLetterArray() As String
sLetterArray() = Split(sMatrix, "~")
Select Case sInput
Case 4: GiveLetters = sLetterArray(iArrStart) & sLetterArray(iArrStart + 1)
Case 5: GiveLetters = sLetterArray(iArrStart + 1)
Case 9: GiveLetters = sLetterArray(iArrStart) & sLetterArray(iArrStart + 2)
Case 6 To 8: GiveLetters = sLetterArray(iArrStart + 1) & String(sInput - 5, sLetterArray(iArrStart))
Case Else: GiveLetters = GiveLetters + String(sInput, sLetterArray(iArrStart))
End Select
End Function
Private Sub Command1_Click()
Dim sRoman As String
sRoman = ToRoman(2002)
End Sub
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