using System;

​

namespace ConsoleApp4

{

    class ExtendedRandom : Random

    {

        public double NextDouble(double min, double max)

        {

            return NextDouble() * (max - min) + min;

        }

    }

​

    class Point2d

    {

        protected int x;

        protected int y;

​

        public Point2d(int x, int y)

        {

            this.x = x;

            this.y = y;

        }

​

        public Point2d() : this(1, 1)

        {

        }

​

        public virtual int Max

        {

            get { return x > y ? x : y; }

        }

​

        public virtual void PrintInfo()

        {

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

        }

​

        public virtual int GetCoordinate(string name)

        {

            return name == "x" ? x : (name == "y" ? y : -1);

        }

​

        public new string ToString()

        {

            return $"x = {x}\ny = {y}\n";

        }

​

        public new bool Equals(object obj)

        {

            Point2d point = (Point2d)obj;

            if (point.x == this.x && point.y == this.y)

            {

                return true;

            }

            else

            {

                return false;

            }

        }

    }

​

    class Circle : Figure

    {

        public double radius;

​

        public Circle()

        {

            radius = 1;

        }

​

        public Circle(double radius)

        {

            this.radius = radius;

        }

​

        public override double Square()

        {

            return Math.PI * this.radius * this.radius;

        }

​

        public override double Perimeter()

        {

            return 2 * Math.PI * this.radius;

        }

    }

​

​

    abstract class Figure

    {

        public abstract double Square();

        public abstract double Perimeter();

    }

    class Program

    {

        static void Main(string[] args)

        {

            ExtendedRandom rnd = new ExtendedRandom();

            rnd.NextDouble(10, 20);

​

            Point2d point = new Point2d();

            Console.WriteLine(point.ToString());

​

            Point2d obj1 = new Point2d();

            Point2d obj2 = new Point2d();

            Console.WriteLine(obj1.Equals(obj2));

​

            Circle circle = new Circle(10);

            Console.WriteLine($"Площадь = {circle.Square():F}");

            Console.WriteLine($"Периметр = {circle.Perimeter():F}");

        }

    }

}

​