import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Calculator
 */
@WebServlet(
		description = "Calculator", 
		urlPatterns = { "/Calculator" }, 
		initParams = { 
				@WebInitParam(name = "txt1", value = "txt1"), 
				@WebInitParam(name = "txt2", value = "txt2")
		})

public class Calculator extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    public Calculator() {
        super();
    }
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
               
                PrintWriter out = response.getWriter();
                String n1 = request.getParameter("txt1");
                String n2 = request.getParameter("txt2");
                String op = request.getParameter("op"); 
               
                
                if(op.equals("Addition")){
                     out.println((Integer.parseInt(n1) + Integer.parseInt(n2)));
                }
                else if(op.equals("Subtraction")){
                     out.println(Integer.parseInt(n1) - Integer.parseInt(n2));                
                }
                else if(op.equals("multiplication")){
                     out.println(Integer.parseInt(n1) * Integer.parseInt(n2));
                }
                else{
                    out.println(Integer.parseInt(n1) / Integer.parseInt(n2));
                }
    }
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}