Author: Jonas Bilinkevicius

How to convert an integer value to a Roman Numeral representation

Answer:

Converts an integer value to a string containing a roman numeric code ("XVII"):
1   
2   {Parameters:   - Num: Integer to convert.
3   Return Value:  - Roman numerical representation of the passed integer value.
4   History:  12/7/99 "Philippe Ranger" (PhilippeRanger@compuserve.com)}
5   
6   function IntToRoman(num: Cardinal): string; {returns num in capital roman digits}
7   const
8     Nvals = 13;
9     vals: array[1..Nvals] of word = (1, 4, 5, 9, 10, 40, 50, 90, 100, 400, 500, 900,
10      1000);
11    roms: array[1..Nvals] of string[2] = ('I', 'IV', 'V', 'IX', 'X', 'XL', 'L', 'XC',
12      'C', 'CD', 'D', 'CM', 'M');
13  var
14    b: 1..Nvals;
15  begin
16    result := '';
17    b := Nvals;
18    while num > 0 do
19    begin
20      while vals[b] > num do
21        dec(b);
22      dec(num, vals[b]);
23      result := result + roms[b]
24    end;
25  end;