using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication23
{

    class ExceptionNaN : Exception
    { 
        public ExceptionNaN(string hlaska) : base( hlaska )
        {

        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            System.IO.StreamWriter sw = new System.IO.StreamWriter("soubor.txt");

            int i=-1;

            while (true)
            {
                try
                {
                    checked
                    {
                        double d = checked(Math.Sqrt(i));

                        if (double.IsNaN(d))
                        {
                            throw new ExceptionNaN("Tohle prece neni cislo!");
                        }

                        d = d / d;
                    }
                    i = 0;
                    i = i / i;
                    i = 57;

                    break;
                }
                catch (ExceptionNaN e)
                {
                    Console.WriteLine("Doslo k vyjimce:");
                    Console.WriteLine(e.Message);
                    Console.WriteLine(e.StackTrace);
                    Console.WriteLine("...ale nebudu to nikde hlasit!");

                    i = 999;

                    throw;

                }
                catch (DivideByZeroException)
                {
                    i = 777;
                }
                finally
                {
                    sw.Close();
                    Console.WriteLine("---finally--");
                }
            }

            Console.WriteLine( i );



        }
    }
}