public static RomanNumeral Sqrt(RomanNumeral a)
        {
            int sqrtResult = (int)Math.Sqrt(a.decimalNumber);

            if (sqrtResult * sqrtResult == a.decimalNumber)
            {
                return(new RomanNumeral(RNConverter.ConvertFromIntToRomanNumeral((int)Math.Sqrt(a.decimalNumber))));
            }
            else
            {
                throw new Exception($"{a.decimalNumber} doesn't have an integer root!");
            }
        }
        private static void ChooseOperator(string word, ref Stack <int> numbers)
        {
            RomanNumeral number1 = new RomanNumeral(numbers.Peek());

            numbers.Pop();
            if (word != "√")
            {
                RomanNumeral number2 = new RomanNumeral(numbers.Peek());
                numbers.Pop();

                switch (word)
                {
                case "+":
                    numbers.Push((number2 + number1).decimalNumber);
                    break;

                case "-":
                    numbers.Push((number2 - number1).decimalNumber);
                    break;

                case "*":
                    numbers.Push((number2 * number1).decimalNumber);
                    break;

                case "/":
                    numbers.Push((number2 / number1).decimalNumber);
                    break;

                case "%":
                    numbers.Push((number2 % number1).decimalNumber);
                    break;

                case "^":
                    numbers.Push((number2 ^ number1).decimalNumber);
                    break;
                }
            }
            else
            {
                numbers.Push(RomanNumeral.Sqrt(number1).decimalNumber);
            }
        }
 public RomanNumeral(RomanNumeral romanNumeral)
 {
     this.decimalNumber   = romanNumeral.decimalNumber;
     this.romanNumeralStr = romanNumeral.romanNumeralStr;
 }