class Object

  # Return true if the object can be converted to a valid integer.
  def valid_int?
    begin
      Integer(self)
      true
    rescue ArgumentError
      false
    end
  end
  
  # Return true if the object can be converted to a valid float.
  def valid_float?
    begin
      Float(self)
      true
    rescue ArgumentError
      false
    end 
  end
end