using System;

using System.Collections.Generic;

​

namespace Lection4

    {

    public class Point2d

    {

        public double x;

        public double y;

​

        public Point2d()

        {

            this.x = 3323;

            this.y = 4534;

        }

​

        public Point2d(double x, double y)

        {

            this.x = x;

            this.y = y;

        }

​

        public void Print()

        {

            Console.WriteLine(" {0}, {1}", x, y);

        }

    }

​

    public class Point3d : Point2d

    {

        public Point3d()

        {

            this.x = 3;

            this.y = 4;

        }

​

        public Point3d(double x, double y)

        {

            this.x = x;

            this.y = y;

        }

​

        public void Print()

        {

            Console.WriteLine(" {0}, {1}, {2}, {3}", x, y, x*y, x-y);

        }

    } 

    public class Program

    {

        public static void Main(string[] args)

        {

         int x = -1;

            Object obj1 = x;

            Object obj2 = (object)x;

​

            Point3d p = new Point3d();

            Point2d p1 = p;

            Point2d p2 = (Point2d)p;

​

            p.Print();

            p1.Print();

            p2.Print();

            List<string> company = new List<string>();

            company.Add("director");

            company.Add("manager");

            company.Add("employee");

            PrintList(company);

​

            company.Remove("employee");

​

            PrintList(company);

​

            company.Insert(2, "employee");

​

            PrintList(company);

​

            company.Reverse();

​

            PrintList(company);

​

            company.Sort();

​

            PrintList(company);

​

            Console.WriteLine(company.IndexOf("employee"));

​

            Dictionary<string, int> logins = new Dictionary<string, int>();

​

            logins.Add("director", 000);

            logins.Add("manager", 4634);

            logins.Add("employee", 3224);

​

            PrintDictionary(logins);

            Console.WriteLine(logins.Count);

​

            logins.Remove("employee");

​

            PrintDictionary(logins);

            Console.WriteLine(logins.Count);

        }

​

        private static void PrintList(List<string> obj)

        {

            foreach (var item in obj)

            {

                Console.Write("{0}\t", item);

            }

            Console.WriteLine();

        }

​

        private static void PrintDictionary(Dictionary<string, int> obj)

        {

            foreach (var item in obj)

            {

                Console.Write("{0}\t", item);

            }

            Console.WriteLine();

        }

    }

}