<% String answer = request.getParameter("answer"), n1 = request.getParameter("n1"), n2 = request.getParameter("n2"), message = request.getParameter("message"); if (message != null) { if (Integer.parseInt(answer) == Integer.parseInt(n1) + Integer.parseInt(n2)) { message = "That's right! "; } else { message = "No, that's wrong... "; } } else { message = "Welcome and so on."; } n1 = ((int) (Math.random() * 100 - 50)) + ""; n2 = ((int) (Math.random() * 100 - 50)) + ""; %>