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

namespace ConsoleApp1
{
    class Database
    {
        List<Person> Datbase;

        public Database()
        {
            Datbase = new List<Person>();
        }
     private void AddPerson()
        {
            string name, surname;
            int birthdate;
            Console.Write("Podaj imie: ");
            name = Console.ReadLine();
            Console.Write("Podaj nazwisko: ");
            surname = Console.ReadLine();
            Console.Write("Podaj datę urodzenia: ");
            birthdate = int.Parse(Console.ReadLine());
            Datbase.Add(new Person(name, surname, birthdate));
        }
        public void DataBaseRunning()
        {
            int numberOfGuys;
            Console.Write("Ile osób chcesz dodać? ");
            numberOfGuys = int.Parse(Console.ReadLine());
            for (int i = 0; i < numberOfGuys; i++)
            {
                Console.WriteLine("Osoba numer: " + (i+1));
                AddPerson();
            }
            Console.WriteLine("Osoby z jakim wiekiem chcesz?");
            int choice = int.Parse(Console.ReadLine());
            var selectedAge =
                from item in Datbase
                where item.BirthDay == choice
                select item;
            if (selectedAge.Count() == 0)
            {
                Console.WriteLine("Brak osób z takim wiekiem");
            }
            else
            {
                foreach (var item in selectedAge)
                {
                    Console.WriteLine(item.ToString());
                }
            }
        }
    }
}