AddressBook

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

namespace ConsoleApplication1
{
    interface ISubscriberF
    {
        void Print();
    }

    class SubscriberFriend : ISubscriberF
    {
        string surname;
        string telephone;
        public string Surname
        {
            get
            {
                return surname;
            }
            set
            {
                surname = value;
            }
        }

        public string Telephone
        {
            get
            {
                return telephone;
            }
            set
            {
                telephone = value;
            }
        }
        public SubscriberFriend(string surname = "", string telephone = "")
        {
            this.surname = surname;
            this.telephone = telephone;
        }
        public void Print()
        {
            Console.WriteLine("ФИО: " + surname + ". Номер: " + telephone);
        }


    }
    class SubscriberEmployee : SubscriberFriend
    {
        string workPhone;
        string position;

        public string WorkPhone
        {
            get
            {
                return workPhone;
            }
            set
            {
                workPhone = value;
            }
        }
        public string Position
        {
            get
            {
                return position;
            }
            set
            {
                position = value;
            }
        }
        public SubscriberEmployee(string surname = "", string telephone = "",string workPhone = "",string position = "")
        {
            base.Surname = surname;
            base.Telephone = telephone;
            this.workPhone = workPhone;
            this.position = position;
        }
        public void Print()
        {
            base.Print();
            Console.WriteLine("рабочий тел.: " + workPhone + " должность: " + position);
        }

    }
    class SubscriberCompetitor : SubscriberEmployee
    {
        string homePhone;
        string homeAddress;
        public string HomePhone
        {
            get
            {
                return homePhone;
            }
            set
            {
                homePhone = value;
            }
        }

        public string HomeAddress
        {
            get
            {
                return homeAddress;
            }
            set
            {
                homeAddress = value;
            }
        }
        public SubscriberCompetitor(string surname = "", string telephone = "",string workPhone = "",string position = "",string homePhone = "", string homeAddress = "")
        {
            base.Surname = surname;
            base.Telephone = telephone;
            base.WorkPhone = workPhone;
            base.Position = position;
            this.homePhone = homePhone;
            this.homeAddress = homeAddress;
        }
        public void Print()
        {
            base.Print();
            Console.WriteLine("дом. тел.: " + homePhone + " дом. адрес: " + homeAddress);
        }
    }

    class AddressBook
    {
        SubscriberFriend[] arrFriend;
        SubscriberEmployee[] arrEmployee;
        SubscriberCompetitor[] arrCompetitor;

        public AddressBook()
        {
            arrFriend = new SubscriberFriend[0];
            arrEmployee = new SubscriberEmployee[0];
            arrCompetitor = new SubscriberCompetitor[0];
        }

        public void AddSubscriber(object obj, string ch)
        {
            switch (ch)
            {
                case "друг":
                case "Друг":
                    SubscriberFriend[] newarrF = new SubscriberFriend[arrFriend.Length + 1];
                    for (int i = 0; i < arrFriend.Length; i++)
                    {
                        newarrF[i] = arrFriend[i];
                    }
                    newarrF[arrFriend.Length] = (SubscriberFriend)obj;
                    arrFriend = newarrF;
                    break;
                case "сотрудник":
                case "Сотрудник":
                    SubscriberEmployee[] newarrE = new SubscriberEmployee[arrEmployee.Length + 1];
                    for (int i = 0; i < arrEmployee.Length; i++)
                    {
                        newarrE[i] = arrEmployee[i];
                    }
                    newarrE[arrEmployee.Length] = (SubscriberEmployee)obj;
                    arrEmployee = newarrE;
                    break;
                case "конкурент":
                case "Конкурент":
                    SubscriberCompetitor[] newarrC = new SubscriberCompetitor[arrCompetitor.Length + 1];
                    for (int i = 0; i < arrCompetitor.Length; i++)
                    {
                        newarrC[i] = arrCompetitor[i];
                    }
                    newarrC[arrCompetitor.Length] = (SubscriberCompetitor)obj;
                    arrCompetitor = newarrC;
                    break;
            }
        }
        public void PrintBook()
        {
            foreach (SubscriberFriend a in arrFriend)
            {
                a.Print();
            }
            foreach (SubscriberEmployee a in arrEmployee)
            {
                a.Print();
            }
            foreach (SubscriberCompetitor a in arrCompetitor)
            {
                a.Print();
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            AddressBook a = new AddressBook();
            string ch;

            while(true)
            {
                Console.Clear();
                Console.Write("Адресная книга\nДобавить абонента - 1\nПросмотреть книгу - 2\nВыйти из приложения - 3\nВаш выбор - ");
                ch = Console.ReadLine();
                switch (ch)
                {
                    case "1":
                        Console.Clear();
                        Console.Write("Абонента какой группы: \nдруг - 1\nсотрудник - 2\nконкурент - 3\nВаш выбор - ");
                        ch = Console.ReadLine();
                        switch (ch)
                        {
                            case "1":
                                Console.WriteLine("Заполните следующие поля: ФИО, телефон");
                                SubscriberFriend f = new SubscriberFriend(Console.ReadLine(), Console.ReadLine());
                                a.AddSubscriber(f, "друг");
                                break;
                            case "2":
                                Console.WriteLine("Заполните следующие поля: ФИО, телефон, рабочий телефон, должность");
                                SubscriberEmployee e = new SubscriberEmployee(Console.ReadLine(), Console.ReadLine(), Console.ReadLine(), Console.ReadLine());
                                a.AddSubscriber(e, "Сотрудник");
                                break;
                            case "3":
                                Console.WriteLine("Заполните следующие поля: ФИО, телефон, рабочий телефон, должность, домашний телефон, домашний адрес");
                                SubscriberCompetitor c = new SubscriberCompetitor(Console.ReadLine(), Console.ReadLine(), Console.ReadLine(), Console.ReadLine(), Console.ReadLine(), Console.ReadLine());
                                a.AddSubscriber(c, "Конкурент");
                                break;
                            default:
                                break;
                        }
                        break;
                    case "2":
                        a.PrintBook();
                        Console.ReadKey();
                        break;
                    case "3":
                    default:
                        return;
                }
            }
        }
    }
}