cleanProjectCPlusPlus

代码说明：

  2 尝试设计翻译方法。假定对程序片段已得到语法树，如 if (a > b) b = a 已得到语法树 编写程序，遍历语法树，执行代码，得到正确结果。 (2 try to design Translation. Has been assumed for the program fragment syntax tree, such as if (a> b) b = a syntax tree has been writing programs, traverses the syntax tree, code, to get the correct results.)