FourDigitNumber

using System;
class FourDigitNumber
{
    static void Main()
    {
        while (true)
        {
            Console.Write("Enter number:");
            string digits = Console.ReadLine();
            char[] inputDigit = digits.ToCharArray();
            char digitOne = digits[0];
            char digitTwo = digits[1];
            char digitThree = digits[2];
            char digitFour = digits[3];
            Console.WriteLine("The separate digits are:{0} - {1} - {2} - {3}",
                digits[0], digits[1], digits[2], digits[3]);
            int convDigitOne = Convert.ToInt32(char.GetNumericValue(digitOne));
            int convDigitTwo = Convert.ToInt32(char.GetNumericValue(digitTwo));
            int convDigitThree = Convert.ToInt32(char.GetNumericValue(digitThree));
            int convDigitFour = Convert.ToInt32(char.GetNumericValue(digitFour));
            int sumDigits = (convDigitOne + convDigitTwo + convDigitThree + convDigitFour);
            Console.WriteLine("The sum of the four digits is: {0}", sumDigits);
            Array.Reverse(inputDigit);
            string reversedDigit = new string(inputDigit);
            Console.WriteLine("The reversed number is:{0}", reversedDigit);
            Console.WriteLine("last digit in the first position:{0}{1}{2}{3}", digitFour, digitOne, digitTwo, digitThree);
            Console.WriteLine("Changed third with second digit:{0}{1}{2}{3}", digitOne, digitThree, digitTwo, digitFour);
        }
    }
}