calculator_app

require 'sinatra'
require 'sinatra/reloader'

get "/:operator/*" do
	operator = params[:operator].to_s
	n = params[:splat][0].split('/')
	n.map!{ |e| e.to_f }
	
	case operator
	when "add"
		n = n.inject{ |sum, n| sum + n }
	when "subtract"
		n = n.inject(0){ |sum, n| sum - n }
	when "multiply"
		n = n.inject(1){ |sum, n| sum * n }
	when "divide"
		for i in (1...n.length)
			n = "Cannot divide by zero!" if n[i] == 0
		end
		n = n.inject{ |sum, n| sum / n }
	end
	
	return "#{n}"
	
end