重点研究指针的一个东东，请那些初学者好好看看，那些老鸟也可以存起来忘记的时候查查，基本每年华为的复试东西都是指针-A focus on the pointer stuff, please take a look at those for beginners, those veterans who can save the time forget the look up, the basic re-examination every year things are pointers Huawei