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C, C++, C#, Java, Visual Basic, HTML, PHP, CSS, Javascript, Ajax, Joomla, MySql y más / Ayuda en convertidor de numero romano a decimal en C#
« en: 31 de Agosto 2016, 02:10 »
Hola, he buscado muchos códigos para convertir de numero romano a decimal pero a la mayoría no le entiendo a el 100% alguien me podría explicar qué hace este codigo 
Código: [Seleccionar]
using System;
using System.Text;
namespace RomanNumerals
{
static class Roman
{
static string[] roman1 = { "MMM", "MM", "M" };
static string[] roman2 = { "CM", "DCCC", "DCC", "DC", "D", "CD", "CCC", "CC", "C" };
static string[] roman3 = { "XC", "LXXX", "LXX", "LX", "L", "XL", "XXX", "XX", "X" };
static string[] roman4 = { "IX", "VIII", "VII", "VI", "V", "IV", "III", "II", "I" };
public static bool TryParse(string text, out int value)
{
value = 0;
if (String.IsNullOrEmpty(text)) return false;
text = text.ToUpper();
int len = 0;
for (int i = 0; i < 3; i++)
{
if (text.StartsWith(roman1[i]))
{
value += 1000 * (3 - i);
len = roman1[i].Length;
break;
}
}
if (len > 0)
{
text = text.Substring(len);
len = 0;
}
for (int i = 0; i < 9; i++)
{
if (text.StartsWith(roman2[i]))
{
value += 100 * (9 - i);
len = roman2[i].Length;
break;
}
}
if (len > 0)
{
text = text.Substring(len);
len = 0;
}
for (int i = 0; i < 9; i++)
{
if (text.StartsWith(roman3[i]))
{
value += 10 * (9 - i);
len = roman3[i].Length;
break;
}
}
if (len > 0)
{
text = text.Substring(len);
len = 0;
}
for (int i = 0; i < 9; i++)
{
if (text.StartsWith(roman4[i]))
{
value += 9 - i;
len = roman4[i].Length;
break;
}
}
if (text.Length > len)
{
value = 0;
return false;
}
return true;
}
public static string ToRoman(int num)
{
if (num > 3999) throw new ArgumentException("Too big - can't exceed 3999");
if (num < 1) throw new ArgumentException("Too small - can't be less than 1");
int thousands, hundreds, tens, units;
thousands = num / 1000;
num %= 1000;
hundreds = num / 100;
num %= 100;
tens = num / 10;
units = num % 10;
var sb = new StringBuilder();
if (thousands > 0) sb.Append(roman1[3 - thousands]);
if (hundreds > 0) sb.Append(roman2[9 - hundreds]);
if (tens > 0) sb.Append(roman3[9 - tens]);
if (units > 0) sb.Append(roman4[9 - units]);
return sb.ToString();
}
}
class Program
{
static void Main()
{
string[] romans = { "I", "MMIV", "DCL", "CCXXII", "IIII", "CZ", "MLXVI", "III", "DCCXIV", "MIM" };
int value = 0;
foreach (string roman in romans)
{
if (Roman.TryParse(roman, out value)) Console.WriteLine("{0} = {1}", roman, value);
}
Console.WriteLine();
int[] numbers = { 1, 2004, 650, 222, 4, 99, 1066, 3, 714, 1999, 3999 };
foreach (int number in numbers)
{
Console.WriteLine("{0} = {1}", number, Roman.ToRoman(number));
}
Console.ReadKey();
}
}
}
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