class BookInStock
 
  attr_accessor :isbn, :price
 
  def initialize isbn, price
    @isbn = isbn
    @price = Float price
  end
 
  def to_s
    "ISBN: #{@isbn}, price: #{@price}"
  end
 
  def price= new_peice
    @price = new_peice
  end
 
  def price_in_cents
    Integer price*100+0.5
  end
 
  def price_in_cents=cents
    @price = cents / 100.0
  end
 
end
 
book = BookInStock.new("isbn1", 33.80)
puts "Price = #{book.price}"
puts "Price in cents = #{book.price_in_cents}"
book.price_in_cents = 1234
puts "Price = #{book.price}"
puts "Price in cents = #{book.price_in_cents}"

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