(define double (lambda (x) (+ x x)))
(double 12)            ; return 24
(double (* 3 4))       ; return 24
(define x 3)
(begin
  (set! x (+ x 1))
  (+ x x))             ; 返回结果 8
(define (abss n)
    (if (< n 0)
        (- 0 n)
        n))
(abss -12)
;sss

public class HelloWorld {
    public static void main(String args[]) {
      System.out.println("Hello World!");
    }
}

<?php

    // change the following paths if necessary
    $yii=dirname(__FILE__).'/../yii/framework/yii.php';
    $config=dirname(__FILE__).'/protected/config/main.php';

    // remove the following lines when in production mode
    define('YII_DEBUG',true);
    // defined('YII_DEBUG') or define('YII_DEBUG',true);
    // specify how many levels of call stack should be shown in each log message
    defined('YII_TRACE_LEVEL') or define('YII_TRACE_LEVEL',3);

    require_once($yii);
    Yii::createWebApplication($config)->run();