查找记录：以姓名为关键字，查找并显示该记录。若查找不到，则姓名显示为NULL。

添加记录：将当前记录按姓名序加入通讯录，然后显示第一条记录。

修改记录：修改当前记录，显示当前记录。想名字段位关键字，不允许被修改。

删除记录：删除当前记录，然后显示第一条记录（假定姓名是关键字，不允许出现相同的名字的记录，即指定姓名就可以唯一确定待删除的记录）。

第一条记录：将当前记录指针移至首节点，若已经是首节点则不动。

前一条记录：将当前记录指针向前移动一个节点，若已经是首节点则不动。

后一条记录：将当前记录指针向后移动一个节点，若已经是尾节点则不动。

最后一条记录：将当前记录指针移至尾节点，若已经是尾节点则不动。

加载：从文件中调入以保存的通讯录数据。

保存：保存通讯录数据。

退出：退出系统。

-Find records: the name of a keyword, find and display the record. If you can not find, the name appears as NULL.

Add Record: order by name of the current record by adding contacts, and then displays the first record.

Revision History: modify the current record, display the current record. Dan would like to name keyword, not allowed to be modified.

Delete Record: Deletes the current record, and then displays the first record (assuming the name is a keyword, not allowed the same name record, that name can be specified uniquely identify the record to be deleted).

First record: the current record pointer to the first node, if the node is not the first move.

Previous record: current record pointer will move forward a node, if the node is not the first move.

After a record: the current record pointer back one node, if the end node is not fixed.

Last record: the end of the current record pointer to the node, if the end node is not fixed.

Load: transferred from the file to save