HW 4_3_1

using System;

namespace HomeWork
{
    class Program
    {
        const string exit = "exit";
        const string totalSum = "sum";
        static void Main(string[] args)
        {
            string inputUser = "";
            int[] numbers = new int[0];
            int countNumbers = 0;
            int newSizeNumbers = 0;
            int sumNumbers = 0;

            while (true)
            {
                Console.WriteLine("Введите число");
                inputUser = Console.ReadLine();

                if (inputUser == exit)
                {
                    break;
                }
                else if (inputUser == totalSum)
                {
                    for (int i = 0; i < countNumbers; i++)
                    {
                        sumNumbers += numbers[i];
                    }
                    Console.WriteLine($"Сумма массива = {sumNumbers} ");
                    Console.WriteLine("-------------------");
                }
                else if (int.TryParse(inputUser, out int number))
                {
                    if (countNumbers == numbers.Length)
                    {
                        newSizeNumbers = numbers.Length + 1;

                        int[] newNumbers = new int[newSizeNumbers];

                        for (int i = 0; i < numbers.Length; i++)
                        {
                            newNumbers[i] = numbers[i];
                        }
                        numbers = newNumbers;
                    }
                    numbers[countNumbers] = number;
                    countNumbers++;
                }
                else
                {
                    Console.WriteLine("Некоректный ввод! Введите целое число.");
                }

                if (countNumbers == 0)
                {
                    Console.WriteLine("\nМассив пустой.");
                }
                else
                {
                    Console.WriteLine("\nИтоговый массив:");
                    for (int i = 0; i < countNumbers; i++)
                    {
                        Console.Write($"{numbers[i]} ");
                    }
                    Console.WriteLine("\n");
                }
            }

            Console.ReadKey();
        }
    }
}