说明：  面对一个人的大型C/C++程序时，只看其对struct 的使用情况我们就可以对其编写者的编程经验进行评估。因为一个大型的C/C++程序，势必要涉及一些(甚至大量)进行数据组合的结构体，这些结构体可以将原本意义属于一个整体的数据组合在一起。从某种程度上来说，会不会用struct，怎样用struct 是区别一个开发人员是否具备丰富开发经历的标志。
(In the face of a large-scale C / C + + program, we can evaluate the programming experience of its author only by looking at its use of struct. Because a large-scale C / C + + program is bound to involve some (or even a large number) structures for data combination, which can combine the data originally belonging to a whole. To some extent, will you use struct? How to use struct is a sign to distinguish whether a developer has rich development experience.)