​

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace CSharpQuiz2

{

    public class Program

    {

        public static void Main(string[] args)

        {

            Product product = new Product(301, "Cep Telefonu", 1300, 250);

            Service service = new Service(601, "Halı Yıkama", 2500, 48);

            Item iteml = new Product(302, "Bilgisayar", 2000, 1550);

            Item item2 = new Service(601, "Araba Yıkama", 1400, 2);

            Inventory inventory = new Inventory(901, "Beykent");

            inventory.ItemList = new List<Item>();

            inventory.ItemList.Add(product);

            inventory.ItemList.Add(service);

            inventory.ItemList.Add(iteml);

            inventory.ItemList.Add(item2);

            Console.WriteLine("Kalemler:");

            foreach (Item item in inventory.ItemList)

            {

                Console.WriteLine("\t" + item.ItemName + " " + item.SalesPrice);

            }

            double averagePrice = inventory.GetAveragePrice();

            Console.WriteLine("Ortalama Fiyat: " + averagePrice);

            double averagePriceMin = inventory.GetAveragePrice(2000);

​

            Console.WriteLine("Ortalama Fiyat (Min 2000): " + averagePriceMin);

            Console.WriteLine("Kalemler (Min 2000):");

            List<Item> resultList = inventory.GetItemsPriceMin(2000);

            foreach (Item item in resultList)

            {

                Console.WriteLine("\t" + item.ItemName + " " + item.SalesPrice);

            }

        }

    }

​

    public class Item

    {

        private string itemName;

        private double salesPrice;

​

        public Item(string itemName, double salesPrice)

        {

            this.ItemName = itemName;

            this.SalesPrice = salesPrice;

        }

        public string ItemName { get => itemName; set => itemName = value;}

        public double SalesPrice { get => salesPrice; set => salesPrice = value;}

    }

    public class Product : Item

    {

        private long productId;

        private double totalWeight;

​

        public Product(long productId, string itemName, double salesPrice, double totalWeight) 

           : base (itemName, salesPrice) 

        {

            this.Productld = productId;

            this.TotalWeight = totalWeight;

        }

        public long Productld { get => productId; set => productId = value; }

        public double TotalWeight { get => totalWeight; set => totalWeight = value; }

    }

    public class Service : Item

    {

        private long serviceId;

        private double totalTime;

​

        public Service(long serviceId, string itemName, double salesPrice, double totalTime )

           : base (itemName, salesPrice) 

        {

            this.Serviceld = serviceId;

            this.TotalTime = totalTime;

        }

        public long Serviceld { get => serviceId; set => serviceId = value; } 

        public double TotalTime { get => totalTime; set => totalTime = value; }

    }

    public class Inventory

    {

        private long inventoryId;

        private string inventoryName;

        private List<Item> itemList;

        public Inventory(long inventoryId, string inventoryName)

        {

            this.Inventoryld = inventoryId;

            this.InventoryName = inventoryName;

        }

        public double GetAveragePrice(double minimumPrice)

        {

            double totalPrice = 0;

            foreach (Item item in itemList)

            {

                if (item.SalesPrice >= minimumPrice)

                {

                    totalPrice += item.SalesPrice;

                }

            }

            double averagePrice = totalPrice / itemList.Count;

            return averagePrice;

        }

        public double GetAveragePrice()

        {

            return GetAveragePrice(0);

        }

        public List<Item> GetItemsPriceMin(double minimumPrice)

        {

            List<Item> resultList = new List<Item>();

            foreach (Item item in itemList)

            {

                if (item.SalesPrice >= minimumPrice)

                {

                    resultList.Add(item);

                }

            }

            return resultList;

        }

        public long Inventoryld { get => inventoryId; set => inventoryId = value; } 

        public string InventoryName { get => inventoryName; set => inventoryName = value; } 

        public List<Item> ItemList { get => itemList; set => itemList = value; }

    }

}

​

​