<%@page errorPage="error.jsp" %> Showing Error Page.
Enter a number:
 
<% if(request.getParameter("txtNum") != null){ if(!request.getParameter("txtNum").equals("")){ int div = Integer.parseInt(request.getParameter("txtNum")) / 0; out.println("Answer is: " + div); } else{ out.println("Please enter a number."); } } %>