using System; 
public class Product { 
   protected string name; 
   protected double cost; 
   protected int inStock; 
   public Product(){ 
      this.name = ""; 
      this.cost = 0; 
      this.inStock = 0; 
   } 
   public Product(string name, double cost, int inStock) 
   { 
      this.name = name; 
      this.cost = cost; 
      this.inStock = inStock; 
   } 
   public int GetInStock() { return this.inStock; } 
   public double Buy(int number) 
   { 
      double totalCost = 0; 
      if (number <= this.inStock){ 
         this.inStock -= number; 
         totalCost = number * this.cost; 
      } 
      return totalCost; 
   } 
} 
 
public class Fruit : Product { 
   public Fruit(string name, double cost, int inStock) 
   { 
      this.name = name; 
      this.cost = cost; 
      this.inStock = inStock;    
   } 
} 
 
public class Veges : Product{ 
   public Veges(string name, double cost, int inStock) 
   { 
      this.name = name; 
      this.cost = cost; 
      this.inStock = inStock; 
   } 
} 
public class TestProduct 
{ 
   public static void Main() 
   { 
      Fruit apple = new Fruit("Apple",2.5,20); 
      Console.WriteLine("{0} in stock {1}", apple, 
         apple.GetInStock()); 
 
      Fruit oranges = new Fruit("Oranges",2.3,50); 
      Console.WriteLine("{0} in stock {1}", oranges, 
         oranges.GetInStock()); 
 
      Veges lettuce = new Veges("Lettuce",3,80); 
      Console.WriteLine("{0} in stock {1}", lettuce, 
         lettuce.GetInStock()); 
 
      Veges cucumber = new Veges("Cucumber",4,5); 
      Console.WriteLine("{0} in stock {1}", cucumber, 
         cucumber.GetInStock()); 
 
        Console.ReadKey(); 
   }       
}

public override string ToString() { return name; }