infinit mxolod jamit

using System.Linq.Expressions;

namespace Infint
{
    class Infint
    {

        static string num1;
        static string num2;

        static char[] charArr1;
        static char[] charArr2;

        static int[] intArr1;
        static int[] intArr1Corrected;
        static int[] intArr2;
        static int[] intArr2Corrected;
        static int[] sumArr;

        static void Main()
        {
            Start();
        }

        static void Start()
        {
            introduction();

            getNum();

            toCharArr(num1,num2);

            printPowTen(charArr1);
            printPowTen(charArr2);

            fillInt1();
            fillInt2();

            sum(intArr1, intArr2);

            printSum();

        }

        #region functions
        //introduction of the program
        static void introduction()
        {
            Console.WriteLine("Hello. This is an INFINIT program.");
            Console.WriteLine("You will have to enter 2 numbers, that are larger than int or long datatype. ");
            Console.WriteLine("Int (- 2 147 483 648 : 2 147 483 647)");
            Console.WriteLine("Long (-9 223 372 036 854 775 808 : 9 223 372 036 854 775 807)");
            Console.WriteLine();
        }
        //end of the introduction function

        //function to get 2 numbers
        static void getNum()
        {
            Console.Write("Enter the first number: ");
            num1 = Console.ReadLine();

            Console.WriteLine();

            Console.Write("Enter the second number: ");
            num2 = Console.ReadLine();

        }
        //end of getNum func

        //function to convert num1 and num2 to char arrays
        static void toCharArr(string num1, string num2)
        {
            charArr1=num1.ToCharArray();
            charArr2=num2.ToCharArray();
        }
        //end of toCharArr func

        //function to turn char arr elements into ints and fill an int arr with these elements
        #region fill functions
        static void fillInt1()
        {
            intArr1 = new int[charArr1.Length];

            for (int i = 0; i < charArr1.Length; i++)
            {
                intArr1[i] = Convert.ToInt32(charArr1[i].ToString());
            }
        }

        static void fillInt2()
        {
            intArr2 = new int[charArr2.Length];

            for (int i = 0; i < charArr2.Length; i++)
            {
                intArr2[i] = Convert.ToInt32(charArr2[i].ToString());
            }
        }
        #endregion
        //end of fillInt func

        //function to print numbers with pows of 10
        #region print functions
        //function to print these numbers with the powers of 10
        static void printPowTen(char[] Arr)
        {
            int index = Arr.Length - 1;

            Console.Write("Number represented in powers of ten: ");
            for (int i = 0; i < Arr.Length; i++)
            {
                if (i + 1 == Arr.Length) { Console.Write($"{Arr[i]} * 10 ^ {index--}"); }
                else if (Arr.Length > i + 1) { Console.Write($"{Arr[i]} * 10 ^ {index--} + "); }
            }
            Console.WriteLine();
            Console.WriteLine();
        }
        #endregion
        //end of printPowTen func

        //function for summition of two numbers
        static void sum(int[] arr1, int[]arr2)
        {
            if (arr1.Length == arr2.Length || arr1.Length > arr2.Length) { sumArr = new int[arr1.Length]; }
            else if (arr1.Length < arr2.Length) { sumArr = new int[arr2.Length]; }

            for (int i = 0; i < sumArr.Length; i++)
            {
                if (arr1.Length == arr2.Length)
                {
                    if (i < arr1.Length && i < arr2.Length) { sumArr[i] = arr1[i] + arr2[i]; }
                    else if (i >= arr1.Length || i >= arr2.Length) { sumArr[i] = 0; }
                    else if (i >= arr1.Length && i < arr2.Length) { sumArr[i] = arr2[i]; }
                    else if (i < arr1.Length && i >= arr2.Length) { sumArr[i] = arr1[i]; }
                }
                else if (arr1.Length > arr2.Length)
                {
                    int difference=arr1.Length - arr2.Length;
                    intArr2Corrected = new int[arr2.Length + difference];
                    for (int f = 0; f < difference; f++) { intArr2Corrected[f + difference] = arr1[f]; }
                    for (int j = 0; j < difference; j++)
                    {
                        arr2[j] = 0;
                    }

                    if (i < arr1.Length && i < arr2.Length) { sumArr[i] = arr1[i] + arr2[i]; }
                    else if (i >= arr1.Length || i >= intArr2Corrected.Length) { sumArr[i] = 0; }
                    else if (i >= arr1.Length && i < intArr2Corrected.Length) { sumArr[i] = arr2[i]; }
                    else if (i < arr1.Length && i >= intArr2Corrected.Length) { sumArr[i] = arr1[i]; }


                }
                else if (arr1.Length < arr2.Length)
                {
                    int difference = arr2.Length - arr1.Length;
                    intArr1Corrected = new int[arr1.Length + difference];
                    for(int f = 0; f < difference; f++) { intArr1Corrected[f+difference] = arr1[f]; }

                    for (int j = 0; j < difference; j++)
                    {
                        intArr1Corrected[j] = 0;
                    }

                    if (i < intArr1Corrected.Length && i < arr2.Length) { sumArr[i] = intArr1Corrected[i] + arr2[i]; }
                    else if (i >= intArr1Corrected.Length || i >= arr2.Length) { sumArr[i] = 0; }
                    else if (i >= intArr1Corrected.Length && i < arr2.Length) { sumArr[i] = arr2[i]; }
                    else if (i < intArr1Corrected.Length && i >= arr2.Length) { sumArr[i] = arr1[i]; }
                }

            }
        }
        //end of func

        //function to print the sum amount
        static void printSum()
        {
            Console.Write("Sum: ");
            int index = sumArr.Length - 1;

            for(int i = 0; i < sumArr.Length; i++)
            {
                if (sumArr.Length > i + 1)
                {
                    Console.Write($"{sumArr[i]} * 10 ^ {index--} + ");
                }
                else
                {
                    Console.Write($"{sumArr[i]} * 10 ^ {index--} ");
                }
            }
        }
        //end of func
        #endregion
    }
}