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


//delegáti
namespace cv04
{
    delegate void fce2();

    class Polozka { 
        public fce2 Fce;
        public string popis;
        public char znak;
    }


    class Program
    {
        delegate double fce(double op1, double op2);
        


        static void Main(string[] args){
            Dictionary<char, Polozka> menu = new Dictionary<char, Polozka>();
            menu.Add('H', new Polozka(){ Fce = new fce2(Hello), popis = "Hello", znak = 'H'});
            menu.Add('N', new Polozka() { Fce = new fce2(Nazdar), popis = "nazdar", znak = 'N' });
            menu.Add('A', new Polozka() { Fce = delegate() { Console.WriteLine("ahoj");  }, popis = "ahoj", znak = 'A' });

            menu['H'].Fce += new fce2(Nazdar);


            while (true) {
                foreach (KeyValuePair<char, Polozka> polozka in menu) { 
                    Console.WriteLine(polozka.Key + " " + polozka.Value.popis);
                }
                string volba = Console.ReadLine();

                if(menu.ContainsKey(volba[0]))
                    menu[volba[0]].Fce();

            }

            



            /////////////////////////////////////////////////////////////////////
            /*fce Operace;

            Operace = new fce(scitani);

            Console.WriteLine(Operace(5, 3));
            //Console.ReadLine();

            //nebo:
            Operace = delegate(double op1, double op2) { return op1 * op2; };

            Console.WriteLine(Operace(5, 3));
            Console.ReadLine();
            */
        }

        static void Hello() {
            Console.WriteLine("hello");
        }

        static void Nazdar()
        {
            Console.WriteLine("nazdar");
        }

        static double scitani(double op1, double op2) {
            return op1 + op2;
        }

        static double odcitani(double op1, double op2) {
            return op1 - op2;
        }
    }
}