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

namespace KsiazkaTele2
{
    public class Person
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string PhoneNumber { get; set; }
        public string[] Addresses { get; set; }

        public static List<Person> People = new List<Person>();

        public static void AddPerson()
        {
            Person person = new Person();

            Console.Write("Enter First Name: ");
            person.FirstName = Console.ReadLine();

            Console.Write("Enter Last Name: ");
            person.LastName = Console.ReadLine();

            Console.Write("Enter Phone Number: ");
            person.PhoneNumber = Console.ReadLine();

            Console.Write("Enter Address 1: ");
            string[] addresses = new string[2];
            addresses[0] = Console.ReadLine();
            Console.Write("Enter Address 2 (Optional): ");
            addresses[1] = Console.ReadLine();
            person.Addresses = addresses;

            People.Add(person);
        }

        public static void PrintPerson(Person person)
        {
            Console.WriteLine("First Name: " + person.FirstName);
            Console.WriteLine("Last Name: " + person.LastName);
            Console.WriteLine("Phone Number: " + person.PhoneNumber);
            Console.WriteLine("Address 1: " + person.Addresses[0]);
            Console.WriteLine("Address 2: " + person.Addresses[1]);
            Console.WriteLine("-------------------------------------------");
        }

        public static void ListPeople()
        {
            if (People.Count == 0)
            {
                Console.WriteLine("Your address book is empty. Press any key to continue.");
                Console.ReadKey();
                return;
            }
            Console.WriteLine("Here are the current people in your address book:\n");
            foreach (var person in People)
            {
                PrintPerson(person);
            }
            Console.WriteLine("\nPress any key to continue.");
            Console.ReadKey();
        }


    }
}

=================================================================================================================================

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

namespace KsiazkaTele2
{
    class Program
    {
        static void Main(string[] args)
        {
            Person p1 = new Person();

            string command = "";
            while (command != "exit")
            {
                Console.Clear();
                Console.WriteLine("Please enter a command: ");
                command = Console.ReadLine().ToLower();
                switch (command)
                {
                    case "add":
                        Person.AddPerson();
                        break;
                    //case "remove":
                    //    Person.RemovePerson();
                    //    break;
                    case "list":
                        Person.ListPeople();
                        break;
                }
            }
        }
    }
}