package mypackage;

import java.io.*;

import javax.servlet.*;

import javax.servlet.http.*;

public class Calculator extends HttpServlet

{

public long addFucn(long first, long second){

return first+second;

}

public long subFucn(long first, long second){

return second-first;

}

public long mulFucn(long first, long second){

return first*second;

}

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException

{

try

{

response.setContentType("text/html");

PrintWriter out= response.getWriter();

int a1= Integer.parseInt(request.getParameter("n1"));

int a2= Integer.parseInt(request.getParameter("n2"));

if(request.getParameter("r1")!=null)

{

out.println("<h1>Addition</h1>"+addFucn(a1, a2));

}

if(request.getParameter("r2")!=null)

{

out.println("<h1>Substraction</h1>"+subFucn(a1, a2));

}

if(request.getParameter("r3")!=null)

{

out.println("<h1>Multiplication</h1>"+mulFucn(a1, a2));

}

RequestDispatcher rd=request.getRequestDispatcher("/index.jsp");

rd.include(request, response);

}

catch(Exception e)

{

}

}

}