# class that is similar to the built-in Range class

class MyRange
  @@count = 0 # class variable to count # of objects constructed

  def initialize(first = 0, last = 10)
    @first = first
    @last = last
    @@count += 1
  end

  def count
    return @@count
  end

  def each
    i = @first
    while i <= @last
      yield i
      i += 1
    end
  end

  attr_reader :first, :last
  attr_writer :first, :last

  def to_s
    return "#{@first}..#{@last}"
  end

  # without attr_reader and attr_writer, we would have done something like this
  #    def first
  #      return @first
  #    end
  #
  #    def first=(n)
  #      @first = n
  #    end
end