using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            //lista generálása

            List<double> szamok = new List<double>();

            Random rnd = new Random();

            int n = szamok.Count;

            for (int i = 0; i < n; i++)

            {

                if (i % 2 == 0) szamok.Add(rnd.Next(10, 51));

                else szamok.Add(rnd.Next(40,81));

            }

            //Egész számítása átlaga

            int sum = 0;

            foreach (int x in szamok)

                sum = sum + x;

            Console.WriteLine("Átlag = {0}", (double) sum / n);

            //Lista feltöltése számokkal fájlból

            List<double> szamok1 = new List<double>();

            StreamReader f = new StreamReader(@"szamok.txt", Encoding.Default);

            while (f.EndOfStream == false)

            {

                string s = f.ReadLine();

                if (s.Trim().Length == 0) break;

                double d = double.Parse( s.Replace('.',','));

            }

            f.Close();

        }

    }