import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Two extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
HttpSession session = request.getSession();
String message = (String) session.getAttribute("message"),
good = (String) session.getAttribute("good"),
total = (String) session.getAttribute("total"),
n1 = (String) session.getAttribute("n1"),
n2 = (String) session.getAttribute("n2"), // state is above
answer = request.getParameter("answer"),
reset = request.getParameter("reset"); // input
if (message == null || reset != null) {
good = "0";
total = "0";
n1 = "" + (int) ((Math.random() * 100) - 50);
n2 = "" + (int) ((Math.random() * 100) - 50);
message = "(" + good + "/" + total + ") What is " +
n1 + " + " + n2 + "? Type your answer here: ";
} else {
int a = Integer.parseInt(n1) + Integer.parseInt(n2);
try {
if (a == Integer.parseInt(answer)) {
good = "" + (Integer.parseInt(good) + 1);
}
} catch (Exception e) { }
total = "" + (Integer.parseInt(total) + 1);
n1 = "" + (int) ((Math.random() * 100) - 50);
n2 = "" + (int) ((Math.random() * 100) - 50);
message = "(" + good + "/" + total + ") What is " +
n1 + " + " + n2 + "? Type your answer here: ";
}
session.setAttribute("message", message);
session.setAttribute("good", good);
session.setAttribute("total", total);
session.setAttribute("n1", n1);
session.setAttribute("n2", n2);
response.setContentType("text/html");
out.println(
"" +
" Lab 04/13 Servlet" +
" " +
" " +
" " +
""
);
}
}