多种编写学生成绩管理系统的方法，内涵单链表程序，双链表程序，数组指针程序，链表文件结合等程序-A variety of preparation methods of student achievement management system, meaning a single linked list program, double-linked list program, the array pointer program, combined with other procedures link

用纯c实现的双向循环链表，类似于通讯录的功能。-The double-way circle linked list is realized with pure c code and its function is similar to the address book.