package com.imooc.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ComputerServlet extends HttpServlet{

@Override

protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

PrintWriter out = response.getWriter();

String num = request.getParameter("n");

int n1 = Integer.parseInt(num);

int sum = 0;

for(int i=0;i<=n1;i++) {

sum = sum + i;

}

out.println("<h1 style='color:red'>" + sum + "</h1>");

}

}