Introduction - If you have any usage issues, please Google them yourself
struct stud_node* create_Stu_Doc() //--- --- --- --- --- --- --- --- 建立链表
struct stud_node* search(struct stud_node*head) //--- --- --- --- --- ----对数据进行查询
struct stud_node* InsertDoc(struct stud_node*head,struct stud_node*stud) //--------插入数据
struct stud_node* Delete(struct stud_node* head) //---------------------------------对数据进行删除
struct stud_node* load(struct stud_node*head)