//Punct.cs
//

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

namespace _028_mostenire
{
    class Punct
    {
        protected int x, y;
        // le-am declarat protected pentru ca ele sa fie private, dar accesibile in clasele derivate din Punct
        public Punct(int _x, int _y)
        {
            x = _x;
            y = _y;
        }
        public int X
        {
            get { return x; }
        }
        public int Y
        {
            get { return y; }
        }
        public override string ToString()
        {
            return "(" + X + "," + Y + ")";
        }
    }

    //Clasa Cerc este clasa derivata din Punct
    class Cerc : Punct
    {
        private double raza;
        // constructor
        public Cerc(int _x, int _y, double R)
            : base(_x, _y)
        {
            raza = R;
        }
        protected double Raza
        {
            get { return raza; }
        }

        public double Diametru
        {
            get { return 2 * raza; }
        }

        public double LungimeCerc()
        {
            return Math.PI * Diametru;
        }

        /*
         * Am definit functie virtuala pentru ca eventualele clase derivate din clasa Cerc
         * sa poate redefini (override) metoda Aria()
         * */

        public virtual double Aria()
        {
            return Math.PI * Raza * Raza;
        }

        public override string ToString()
        {
            return "Cerc cu centrul ( " + x + "," + y + " ) si raza " + raza + "\n";
        }
    }
    class Cilindru : Cerc
    {
        protected double h; // initializarea cilindrului
        //constructor
        public Cilindru(int _x, int _y, double R, double _h)
            : base(_x, _y, R)
        {
            h = _h;
        }
        public override double Aria()
        {
            return 2 * base.Aria();
        }
    }
}


//Program.cs
//

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

namespace _028_mostenire
{
    class Program
    {
        static void Main(string[] args)
        {
            Punct P = new Punct(1, 1);
            Cerc C = new Cerc(3, 3, 2);
            Console.WriteLine(P);
            Console.WriteLine(C);
            Console.WriteLine("Aria = " + C.Aria());

        }
    }
}