import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class circle extends HttpServlet {
public void
doGet(HttpServletRequest request,
HttpServletResponse
response)
throws
ServletException, IOException {
response.setContentType("text/html");
PrintWriter
out = response.getWriter();
out.println( "<BODY><H1 ALIGN=CENTER>
Circle Info </H1>\n");
try{
String sdiam =
request.getParameter("diameter");
double diam =
Double.parseDouble(sdiam);
out.println("<BR><H3>Diam:</H3>" + diam
+
"<BR><H3>Area:</H3>"
+ diam/2.0 * diam/2.0 * 3.14159 +
"<BR><H3>Perimeter:</H3>"
+ 2.0 * diam/2.0 * 3.14159);
} catch ( NumberFormatException e ){
out.println("Please enter a valid
number");
}
out.println("</BODY></HTML>");
}