# prac0202.rb
# 2次元座標クラス その2

class Point
  def initialize( x, y )
	@x = x
	@y = y
  end

  def show
	print "(",@x,",",@y,")\n"
  end

  def distance
	return Math::sqrt(@x*@x+@y*@y)
  end
end

p1 = Point.new(3,4)
puts p1.distance