// Amado Jeremiah B. Galzote

// BSIT 3-4

​

namespace MidtermCode4{

using System;

​

public class Converter {

    public virtual int Value(char roman_numeral){

        if (roman_numeral == 'M'  || roman_numeral == 'm')

            return 1000;

        else if (roman_numeral == 'D' || roman_numeral == 'd')

            return 500;

        else if (roman_numeral == 'C' || roman_numeral == 'c')

            return 100;

        else if (roman_numeral == 'L' || roman_numeral == 'l')

            return 50;

        else if (roman_numeral == 'X' || roman_numeral == 'x')

            return 10;

        else if (roman_numeral == 'V' || roman_numeral == 'v')

            return 5;

        else if (roman_numeral == 'I' || roman_numeral == 'i')

            return 1;

        return -1;

    }

​

    public virtual int RomanToArabic(string str){

        int result = 0;

        for (int i = 0; i < str.Length; i++){

            int str1 = Value(str[i]);

            if (i + 1 < str.Length){

                int str2 = Value(str[i + 1]);

                if (str1 >= str2){

                    result = result + str1;

                }

                else{

                   result = result + str2 - str1;

                   i++;

                }

            }

            else{

                result = result + str1;

                i++;

            }

        }

        return result;

    }

​

​

    public static void Main() {

        Console.Write("Enter the roman numeral:");

        String input = Console.ReadLine();

        Converter Converter = new Converter();

        Console.Write("In arabic :" +Converter.RomanToArabic(input));

    }

}

}