指针是Ｃ语言的精华，是Ｃ语言最重要的内容之一，也是最难掌握的部分。在程序中可以使用指针来处理数据、变量、数组、字符串、函数、结构体、文件及动态分配内存等。正确地使用指针，可以使程序精简、灵活、高效。指针的概念比较复杂，如果误用指针，程序运行将出现意想不到的错误，这是初学指针应注意的问题。因此指针是Ｃ语言的重点和难点-Pointer is the essence of the C language, is one of the most important elements of the C language, is part of the most difficult to master. Pointer can be used in the program to process the data, variables, arrays, strings, functions, structure, file and dynamically allocated memory, and so on. The right to use the pointer, can make the process streamlined, flexible, and efficient. Pointer concept is complex, if misused pointer, the program runs unexpected error, this is a beginner the pointer should note the problem. So the pointer is the emphasis and difficulty of the C language