说明：  何为指针？ 　　指针基本上和其它的变量一样，唯一的一点不同就是指针并不包含实际的数据，而是包含了一个指向内存位置的地址，你可以在这个地址找到某些信息。这是一个很重要的概念，并且许多程序或者思想都是将指针作为它们的设计基础，例如链表。
(what target? Guidelines and basically the same as other variables, the only difference is that it is 1:00 guide does not contain the actual data, but contains a memory location at the address, you can find the addresses of some of the information. This is a very important concept, and many procedures or are thinking as they will guide the design, such as the linked list.)