Method08

using System;
using System.Collections.Generic;

namespace _08.SumOfArraysInteger
{
    class SumOfArraysInteger
    {
        static int[] ArrayInput()
        {
            Console.WriteLine("Enter the length of the array: ");
            int n = int.Parse(Console.ReadLine());

            int[] array = new int[n];

            //Reverse
            for (int i = n - 1; i >= 0; i--)
            {
                Console.Write("Enter the digit: ");
                array[i] = int.Parse(Console.ReadLine());
            }
            return array;
        }

        static void PrintFormated(int[] array)
        {
            for (int i = array.Length - 1; i >= 0; i--)
            {
                Console.Write(array[i]);
            }
        }

        static List<int> SumOfIntegerArrays(int[] arrayX, int[] arrayY)
        {
            List<int> sumList = new List<int>();

            int currentSum = 0;
            byte special = 0;

            int loopLengthMax = Math.Max(arrayX.Length, arrayY.Length);
            int loopLengthMin = Math.Min(arrayX.Length, arrayY.Length);

            for (int i = 0; i < loopLengthMax; i++)
            {
                if (i < loopLengthMin)
                {
                    currentSum = (arrayX[i] + arrayY[i] + special);
                    if (currentSum >= 10)
                    {
                        currentSum = currentSum % 10;
                        special = 1;
                    }
                    else
                    {
                        special = 0;
                    }
                    sumList.Add(currentSum);
                }
                if (i >= loopLengthMin)
                {
                    if (arrayX.Length > arrayY.Length)
                    {
                        currentSum = arrayX[i] + special;
                        if (currentSum >= 10)
                        {
                            currentSum = currentSum % 10;
                            special = 1;
                        }
                        else
                        {
                            special = 0;
                        }
                        sumList.Add(currentSum);
                    }
                    if (arrayX.Length < arrayY.Length)
                    {
                        currentSum = arrayY[i] + special;
                        if (currentSum >= 10)
                        {
                            currentSum = currentSum % 10;
                            special = 1;
                        }
                        else
                        {
                            special = 0;
                        }
                        sumList.Add(currentSum);
                    }
                }
            }
            if (special > 0) sumList.Add(special);

            sumList.Reverse();
            return sumList;
        }

        static void Main()
        {
            int[] firstArray = ArrayInput();
            int[] secondArray = ArrayInput();

            PrintFormated(firstArray);
            Console.Write(" + ");
            PrintFormated(secondArray);
            Console.Write(" = ");

            foreach (var item in SumOfIntegerArrays(firstArray, secondArray))
            {
                Console.Write(item);
            }
            Console.WriteLine();
        }
    }
}