using System;

using System.Collections.Generic;

namespace Midterm

{

    class Roman

    {

        public int calculateRomanNumber(string s)

        {

            int sum = 0;

            Dictionary<char, int> romanNumbers = new()

            {

                { 'I', 1 },

                { 'V', 5 },

                { 'X', 10 },

                { 'L', 50 },

                { 'C', 100 },

                { 'D', 500 },

                { 'M', 1000 }

            };

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

            {

                char currentChar = s[i];

                romanNumbers.TryGetValue(currentChar, out int num);

                if (i + 1 < s.Length && romanNumbers[s[i + 1]] > romanNumbers[currentChar])

                {

                    sum -= num;

                }

                else

                {

                    sum += num;

                }

            }

            return sum;

        }

​

        public int calculateRomanNumber(char s)

        {

            int sum = 0;

            Dictionary<char, int> romanNumbersList = new()

            {

                { 'I', 1 },

                { 'V', 5 },

                { 'X', 10 },

                { 'L', 50 },

                { 'C', 100 },

                { 'D', 500 },

                { 'M', 1000 }

            };

​

​

            for (int i = 0; i < 1; i++)

            {

                char currentRomanChar = s;

                romanNumbersList.TryGetValue(currentRomanChar, out int num);

                if (i + 1 < 1 && romanNumbersList[s] > romanNumbersList[currentRomanChar])

                {

                    sum -= num;

                }

                else

                {

                    sum += num;

                }

            }

            return sum;

        }

    }

​

    class Program

    {

        public static void Main()

        {

            string romanNum;

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

            romanNum = Console.ReadLine();

            romanNum = romanNum.ToUpper();

​

            Console.Write("In arabic: ");

            Roman roman = new Roman();

            Console.WriteLine(roman.calculateRomanNumber(romanNum));

        }

    }

}

​

​