using System;

​

namespace RomToHin

{

    public class Program 

    {   

        public static void Main(string[] args)

        {

            Console.WriteLine("Enter RM: ");

            string str1 = Console.ReadLine();

            string str = str1.ToUpper();

            GFG ob = new GFG();

            int fin = ob.romanToDecimal(str);

            Console.WriteLine("Integer form of Roman Numeral" + " is " + fin);

        }

    }

​

    public class AssignRomVal

    {

        public virtual int romanToDecimal(char r)

        {

            if (r == 'I')

                return 1;

            if (r == 'V')

                return 5;

            if (r == 'X')

                return 10;

            if (r == 'L')

                return 50;

            if (r == 'C')

                return 100;

            if (r == 'D')

                return 500;

            if (r == 'M')

                return 1000;

            return -1;

        }

    }

    public class GFG : AssignRomVal 

    {

        public virtual int romanToDecimal(string str)

        {

            int res = 0;

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

            {

                int s1 = romanToDecimal(str[i]);

            if (i + 1 < str.Length)

            {

                int s2 = romanToDecimal(str[i + 1]);

​

                // Comparing both values

                if (s1 >= s2)

                {

                    // Value of current symbol is greater

                    // or equalto the next symbol

                    res = res + s1;

                }

                else

                {

                    res = res + s2 - s1;

                    i++; // Value of current symbol is

                    // less than the next symbol

                }

            }

            else {

                res = res + s1;

                i++;

            }

        }

        return res;

    }

}

}

​