using System;
using System.IO;

namespace Array_File
{
    class Program
    {
        const string ERROR_MSG = "wrong";

        static int InputIntN(string errorMsg)
        {
            Console.WriteLine("Enter array length: ");
            string s = Console.ReadLine();
            int N;
            if (!int.TryParse(s, out N) || N < 1 || N > 100)
            {
                Console.WriteLine(errorMsg);
                return InputIntN(ERROR_MSG);
            }

            return N;
        }


        static void InputElements(string errorMsg, int N, int[] numbers, ref double count)
        {
            string[] arr = new string[N];

            for (int i = 0; i < N; i++)
            {
                Console.WriteLine("Enter array elements: ");
                arr[i] = Console.ReadLine();

                while (!int.TryParse(arr[i], out numbers[i]))
                {
                    Console.WriteLine(errorMsg);
                    Console.WriteLine("Enter array elements: ");
                    arr[i] = Console.ReadLine();
                }

                if (numbers[i] < 0)
                {
                    numbers[i] = 0;
                }

                count += numbers[i];
            }
        }


        static void Main()
        {
            do
            {
                int N = InputIntN(ERROR_MSG);
                int[] numbers = new int[N];
                double count = 0;

                InputElements(ERROR_MSG, N, numbers, ref count);

                string str = String.Join(" ", numbers);

                string file_name = "output.txt";

                try
                {
                    File.Delete(file_name);
                    File.AppendAllText(file_name, str);
                    File.AppendAllText(file_name, "\n" + (count / N).ToString("f3"));
                }

                catch (IOException ex)
                {
                    Console.WriteLine(ex.Message);
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                }
                Console.WriteLine("To exit from program press ESCAPE. To restart this program press any key.....");
            } while (Console.ReadKey(true).Key != ConsoleKey.Escape); //  Повтор решения.
        }
    }
}