<html> <head> <title>online exam</title> </head> <body> <div align="center"> <form method="post" action="Tab"> <p>4.what is currency of USA?</p> <input type="radio" name="d" onclick="getAnswer('a')" value="a "/>dollar <input type="radio" name="d" onclick="getAnswer('b')" value="b "/>pound <input type="radio" name="d" onclick="getAnswer('c')" value="c "/>rupees <input type="radio" name="d" onclick="getAnswer('d')" value="d "/>yen<br /> </form> </div> </body> </html> package src; import java.io.*; import java.net.*; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; public class Tab extends HttpServlet { protected void processRequest(HttpServletRequest request, HttpServletResponse response throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); int count=0,wrng=0; String radio0=request.getParameter("a"); out.println(radio0); if("c".equals(radio0)) count++; else wrng++; out.println("<html><head><title>result</title></head><body>" + "<div align=\"center\"><h1><u>Result</u></h1><p>correct answers are:</p>"+count+"<br/><p>wrong answers are :</p>"+wrng+"</div></body></html>"); out.close(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } public String getServletInfo() { return "Short description"; } }
//Here the radio0 returns null value.pls advice me
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