using System;

using System.Collections.Generic;

​

namespace Test

{

    public class Sekil

    {

        public Sekil(string sekilAdi, int? kenar1, int? kenar2, int? kenar3, int? kenar4)

        {

            SekilAdi = sekilAdi;

            Kenar1 = kenar1;

            Kenar2 = kenar2;

            Kenar3 = kenar3;

            Kenar4 = kenar4;

        }

​

        public string SekilAdi { get; set; }

​

        public int? Kenar1 { get; set; }

        public int? Kenar2 { get; set; }

        public int? Kenar3 { get; set; }

        public int? Kenar4 { get; set; }

    }

​

​

    public class Program

    {

        public static void Main()

        {

            var sekiller = new List<Sekil>()

            {

                new Sekil("Ucgen", 5, 10, 20, null),

                new Sekil("Dikdortgen", 5, 5, 20, 20),

                new Sekil("Kare", 5, 5, 5, 5),

            };

​

            foreach (var sekil in sekiller)

            {

                if (sekil.SekilAdi == "Ucgen")

                {

                    Console.WriteLine($"Ucgen Alani: {(sekil.Kenar1 * sekil.Kenar2) / 2}");

                }

                else if (sekil.SekilAdi == "Dikdortgen")

                {

                    Console.WriteLine($"Dikdortgen Alani: {sekil.Kenar1 * sekil.Kenar3}");

                }

​

                else if (sekil.SekilAdi == "Kare")

                {

                    Console.WriteLine($"Kare Alani: {sekil.Kenar1 * sekil.Kenar2}");

                }

                else

                {

                    throw new Exception("Geçersiz Sekil !!!");

                }

            }

        }

    }

}