/* 自定义LinkList单链表类型 */　　　
/*函数，用尾插入法建立带头结点的单链表*/　　　　
/*函数，用头插入法建立带头结点的单链表 */
/*函数，按值查找结点　*/
/*函数，删除指定值的结点　*/
　　/*函数，打印链表中的所有值*/
　 /*函数，删除所有结点，释放内存 */
　　/*修改程序：增加节点。用头插法，返回头指针*/(Custom LinkList single chain type / * * /
* / function, establish a lead single node list * tail insertion
* / function, establish a lead single node list * head insert
* / function, according to the value of search node.
* / function, delete the specified value of the node.
* / function, all the values in the list * / print
* / function, delete all nodes, release the memory.
Should modify the program: add nodes. With the first interpolation method, return the head pointer.)