Homework 5 Problem 6

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HomeWork5_4digits
{
    class digits4
    {
        static void Main(string[] args)
        {
            /*            Write a program that takes as input a four-digit numberin format abcd(e.g. 2011) and performs the following:
            Calculates the sum of the digits (in our example 2 + 0 + 1 + 1 = 4).
            Prints on the console the number in reversed order: dcba(in our example 1102).
            Puts the last digit in the first position:
                        dabc(in our example 1201).
            Exchanges the second and the third digits: acbd(in our example 2101).
            The number has always exactly 4 digits and cannot start with 0.Examples:

            n sum of digits   reversed last digit in front second and third digits exchanged
            2011    4   1102    1201    2101
            3333    12  3333    3333    3333
            9876    30  6789    6987    9786*/

            string nStr = Console.ReadLine();
            int sum = 0;
            int a = 0; int b = 0; int c = 0; int d = 0;
            a = int.Parse(nStr[0].ToString()); b = int.Parse(nStr[1].ToString()); c = int.Parse(nStr[2].ToString()); d = int.Parse(nStr[3].ToString());
            sum = a + b + c + d;
            //Namirane na sumata
            char[] numbers = nStr.ToCharArray();
            Array.Reverse(numbers);
            string nStrReverse = new string(numbers);

            string numFirstLast = nStr[3].ToString() + nStr[0] + nStr[1] + nStr[2];

            string numSecondThird = nStr[0].ToString() + nStr[2] + nStr[1] + nStr[3];

            Console.WriteLine("|   n   |  sum  |revers |LastFir|SecTr  |");
            Console.WriteLine("|{0,7}|{1,7}|{2,7}|{3,7}|{4,7}|", nStr, sum, nStrReverse, numFirstLast, numSecondThird);

        }
    }
}