Shoes.app :height => 200 ,:width => 230,:resizable => false do
	stack :height => "100%", :width => "100%" do
		flow :height => "30%", :width => "100%" do
			para @res
		end
		flow :height => "70%", :width => "80%" do
			1.upto(9) do
				|num|
				button num,:width => 46, :height => 46 do
					if @num1 == 0
						@num1 = num
					else
						@num2 = num
					end
				end
			end
		end
		flow :height => "70%", :width => "20%" do
			['+','-','/','*','='].each do
				|op|
				button(op,:width => 46, :height => 46)
			end
		end
	end
end