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class Fixnum
  # Format a number with commas and a decimal point
  def commify
    to_s =~ /([^\.]*)(\..*)?/
    int, dec = $1.reverse, $2 ? $2 : ""
    while int.gsub!(/(,|\.|^)(\d{3})(\d)/, '\1\2,\3')
    end
    int.reverse + dec
  end

  def is_even?
    self % 2 == 0
  end

  def is_odd?
    !is_even?
  end
end