using System;

​

public class Program

{

    public static void Main()

    {

        Fruit f = new Fruit("Apple", 0);

        //Print Fruit

        PrintInfo(f);

        Fruit f1 = new Fruit("Peach", 12);

        //Print Fruit

        PrintInfo(f1);

        Vegetable veg = new Vegetable("Potato");

        //Print Vegetable

        PrintInfo(veg);

        // Null Check

        Fruit f2 = null;

        //Print Fruit

        PrintInfo(f2);

    }

    public static void PrintInfo(object food)

    {

        switch (food)

        {

            case Fruit item when (item.Quantity == 0):

                Console.WriteLine($"{item.Name} is a {nameof(Fruit)}. Out of Stock.");

                break;

            case Fruit item:

                Console.WriteLine($"{item.Name} is a {nameof(Fruit)}. Quantity available {item.Quantity}.");

                break;

            case Vegetable item:

                Console.WriteLine($"{item.Name} is a {nameof(Vegetable)}.");

                break;

            case null:

                // throw new ArgumentNullException(nameof(food));

                Console.WriteLine("Invalid food.");

                break;

            default:

                Console.WriteLine("Food info not found.");

                break;

        }

    }

}

public class Fruit

{

    public string Name{get; set;}

    public int Quantity{get; set;}

    public Fruit(string name, int quantity){

        Name = name;

        Quantity = quantity;

    }

}

​

public class Vegetable

{

    public string Name{get; set;}

    public Vegetable(string name){

        Name = name;

    }

}