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

namespace gyakorlas
{
    class allat
    {
        private string nev;
        private int mkor;
        public allat (string _nev, int _mkor)
        {
        nev = _nev;
        mkor = _mkor;
        }
        public allat()
        {
            nev = "NÉV";
            mkor = 0;
        }
        public string getnev()
        {
            return nev;
        }
        public int getmkor
        {
            get
            {
                return mkor;
            }

        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            allat obj1 = new allat("Oroszlán", 22);
            Console.WriteLine(obj1.getnev()+ "\t "+ obj1.getmkor);
            allat obj2 = new allat("Bodri", 15);
            Console.WriteLine(obj2.getnev() + "\t " + obj2.getmkor);
            allat obj3 = new allat("Macska", 15);
            Console.WriteLine(obj3.getnev() + "\t " + obj3.getmkor);
            allat obj4 = new allat();
            Console.WriteLine(obj4.getnev() + "\t " + obj4.getmkor);


            Console.ReadKey();
        }
    }
}

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

namespace kor
{
    class kor
    {
        private double r;
        public kor(double sugar)
        {
            r = sugar;
        }
        public kor ()
        {
            r = 0;
        }
        public double terulet
        {
            get
            {
                return Math.Pow(r, 2) * Math.PI;
            }
        }
        public double kerulet
        {
            get
            {
                return 2*r * Math.PI;
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("A kör kerületi és területi adatai a következők: ");
            kor k1 = new kor(11.2);
            Console.WriteLine("\tT= {0:0.00} cm", k1.terulet);
            kor k2 = new kor(11.2);
            Console.WriteLine("\tK= {0:0.00} cm2 ", k2.kerulet);

            Console.ReadKey();
        }
    }
}