u5_3

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

namespace ConsoleApplication108
{
    interface IcalcArea
    {
        double area { get; set; }
        double calculateA();
    }
    interface IcalcCurum
    {
        double circum { get; set; }
        double calculateC();
    }

    abstract class Object
    {
        public string name;
        public string color;
        public abstract void show();
    }

    class circle: Object, IcalcArea, IcalcCurum
    {
        double r; // radius
        public double circum
        {
            get
            {
                return circum;
            }
            set
            {
                this.circum = value;
            }
        }
        public double calculateC()
        {
            circum = 2 * Math.PI * r;
            return circum;
        }
        public double area
        {
            get
            {
                return area;
            }
            set
            {
                this.area = value;
            }
        }
        public double calculateA()
        {
            area = Math.PI * r * r;
            return area;
        }
        public override void show()
        {
            Console.WriteLine("Name: " + name);
            Console.WriteLine("Color: " + color);
            Console.WriteLine("Radius:" + r);
            Console.WriteLine("Area: {0}", area);
            Console.WriteLine("Circum: {0}", circum);
            Console.WriteLine("Circle");
        }

    }

    class Program
    {
        static void Main(string[] args)
        {

            circle c = new circle();
            c.calculateC();
            c.calculateA();
            c.show();
        }
    }
}