示例#1
0
        private int findRomanSpecialNumber(romanDigit character)
        {
            double conditionNumber = (int)character;

            while (conditionNumber > 10)
            {
                conditionNumber *= 0.1;
            }
            return((conditionNumber % 2 == 0) ? (int)((int)character * 0.9) : (int)((int)character - ((int)character * 0.2)));
        }
示例#2
0
        /// <summary>
        /// Converts a roman numeral into an arabic number.
        /// </summary>
        /// <param name="num">A roman numeral.</param>
        /// <returns>AN arabic number.</returns>
        public int ConvertRomanToArabic(string num)
        {
            if (num == null)
            {
                return(0);
            }
            int        i = 0, value = 0;
            var        numberString      = num.ToUpper().Trim();
            int        amountOfChars     = numberString.Length;
            var        romanCharacters   = Enum.GetValues(typeof(romanDigit));
            int        currentRomanDigit = romanCharacters.Length;
            romanDigit character         = (romanDigit)romanCharacters.GetValue(--currentRomanDigit);

            // A Guardian instance checks if a romanDigit in the roman numeral appears maximum three times,
            // otherwise it throws an exception.
            Guardian guardian = new Guardian(3, () => { throw new Exception("Your number format is wrong."); });

            do
            {
                if (character.ToString() == numberString[i].ToString())
                {
                    guardian.Call();
                    value += (int)character;
                    i++;
                }
                else
                {
                    if ((amountOfChars - i) > 1)
                    {
                        int specialSymbol      = findRomanSpecialNumber(character);
                        romanSpecialNumber rsn = (Enum.GetValues(typeof(romanSpecialNumber))).OfType <romanSpecialNumber>().ToList().Find(x => (int)x == specialSymbol);
                        if (numberString.Substring(i, 2) == rsn.ToString())
                        {
                            value += (int)rsn;
                            i     += 2;
                        }
                    }

                    if (currentRomanDigit == 0)
                    {
                        throw new Exception("You gave a wrong sign in your roman number or one of the " +
                                            "digits is on a wrong position");
                    }
                    character = (romanDigit)romanCharacters.GetValue(--currentRomanDigit);
                    guardian.ResetNumberOfCalls();
                }
            }while (amountOfChars > i);
            return(value);
        }
示例#3
0
        /// <summary>
        /// Converts an arabic number into a roman numeral.
        /// A number to convert must be in the range of 0 to 3999.
        /// </summary>
        /// <param name="num">An arabic number to convert.</param>
        /// <returns>A roman numeral.</returns>
        public string ConvertArabicToRoman(int num)
        {
            if (num > 3999 || num <= 0)
            {
                return(null);
            }

            int           number          = num;
            StringBuilder value           = new StringBuilder();
            var           romanCharacters = Enum.GetValues(typeof(romanDigit));
            int           i         = romanCharacters.GetLength(0) - 1;
            romanDigit    character = (romanDigit)romanCharacters.GetValue(i);

            do
            {
                if (number >= (int)character)
                {
                    value.Append(character);
                    number = number - (int)character;
                }
                else
                {
                    if (character != romanDigit.I)
                    {
                        int specialSymbol = findRomanSpecialNumber(character);
                        if (specialSymbol <= number)
                        {
                            romanSpecialNumber rsn = (Enum.GetValues(typeof(romanSpecialNumber))).OfType <romanSpecialNumber>().ToList().Find(x => (int)x == specialSymbol);
                            value.Append(rsn);
                            number -= (int)rsn;
                        }
                    }
                    character = (romanDigit)romanCharacters.GetValue(--i);
                }
            }while (number > 0);
            return(value.ToString());
        }