Mega Code Archive
Converts an integer into a roman numeral
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//http://advancementvoyage.codeplex.com/
//Microsoft Public License (Ms-PL)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace AdvancementVoyage.Magic.Utility
{
/// <summary>
/// Extension methods for the int type.
/// </summary>
public static class IntExtensions
{
/// <summary>
/// Converts an integer into a roman numeral.
/// </summary>
/// <param name="number">
/// The number being transformed.
/// </param>
/// <returns>
/// A string representation of the number's corresponding roman numeral.
/// </returns>
public static string ToRomanNumeral(this int number)
{
var retVal = new StringBuilder(5);
var valueMap = new SortedDictionary<int, string>
{
{ 1, "I" },
{ 4, "IV" },
{ 5, "V" },
{ 9, "IX" },
{ 10, "X" },
{ 40, "XL" },
{ 50, "L" },
{ 90, "XC" },
{ 100, "C" },
{ 400, "CD" },
{ 500, "D" },
{ 900, "CM" },
{ 1000, "M" },
};
foreach (var kvp in valueMap.Reverse())
{
while (number >= kvp.Key)
{
number -= kvp.Key;
retVal.Append(kvp.Value);
}
}
return retVal.ToString();
}
}
}
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