Magento simple Hello World extension: Index action controller

IndexController.php

/**
 * Magento simple Hello World extension: Index action controller
 *
 * Action controller that loads and renders the layout
 * provided for documentation purposes in the
 * Magento 1.x Extension Developer's Guide
 * 
 * @copyright Copyright (c) 2013 eBay Inc. (http://www.magentocommerce.com)
 */

<?php
class Tutorials_HelloWorld_IndexController extends Mage_Core_Controller_Front_Action
{
    public function indexAction()
    {
        $this->loadLayout();

        $this->renderLayout();
    }

    public function helloWorldAction()
    // Loads and renders the layout, helloworld.phtml
    {
        $this->loadLayout();
        $this->renderLayout();
    }
}