?using System;
using System.Collections.Generic;
using System.Text;

namespace BookManager
{
    public class POS
    {
        public double Scan(Book book)
        {
            double last = 0;
            switch (book.Type)
            {
                case BookType.English:
                    last = new EnglishDiscount().GetNewPrice(book.UnitPrice);
                    break;
                case BookType.Computer:
                    last = new ComputerDiscount().GetNewPrice(book.UnitPrice);
                    break;
                case BookType.Story:
                    last =new StoryDiscount().GetNewPrice(book.UnitPrice);
                    break;
            }
            return last;
        }
        
    }
}