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Delphi source code for Math >> Convert a decimal number to roman numerals


Category: Math
Title: Convert a decimal number to roman numerals
Date added: 15.03.2006
Hits: 11448



function DecToRoman(Decimal: Longint): string;
const
  Numbers: array[1..13] of Integer =
    (1, 4, 5, 9, 10, 40, 50, 90, 100,
    400, 500, 900, 1000);
  Romans: array[1..13] of string =
    ('I', 'IV', 'V', 'IX', 'X', 'XL',
    'L', 'XC', 'C', 'CD', 'D', 'CM', 'M');
var
  i: Integer;
begin
  Result := '';
  for i := 13 downto 1 do
    while (Decimal >= Numbers[i]) do
    begin
      Decimal := Decimal - Numbers[i];
      Result  := Result + Romans[i];
    end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  label1.Caption := DecToRoman(5);
  Label2.Caption := DecToRoman(458);
end;

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