using System;

​

​

public class Program

{

    class Rectangle

    {

        // default constructor

        public Rectangle()

        {

        }

        // constructor

        public Rectangle(Rectangle rect)

        {

            A = rect.A;

            B = rect.B;

        }

        // constructor

        public Rectangle (double a, double b)

        {

            A = a;

            B = b;

        }

        // properties:

        public double A { get; private set; }

​

        public double B { get; private set; }

​

        // property for a perimeter (getter only)

        public double P

        {

            get {return GetP();}

        }

        //method for recieve area

        public double GetArea ()

        {

            double s = A * B;

            return s;

        }

​

        //method for recieve perimeter

        public double GetP ()

        {

            double p = (A+B)*2;

            return p;

        }

        //ovveride method ToString. It is defined in class object. Acll classes inherited from class Object in .net 

        override public string ToString()

        {

            return System.Text.Json.JsonSerializer.Serialize<Rectangle>(this);

        }

    }

​

    public static void Main()

    {

        Rectangle rect = new Rectangle(9.25, 5.5);

​

        Console.WriteLine(rect);

        Console.WriteLine(rect.GetArea());

        Console.WriteLine(rect.GetP());

        Console.WriteLine(rect.P);

        Console.WriteLine();

        Rectangle rect2 = new Rectangle(rect);

        Console.WriteLine(rect2);

    }

}