创建一个单链表，实现该单链表的就地逆置，并将前后情况打印出来-Create a single list, to achieve the single-place against the set list, and print out the situation before and after. .

数据结构，单链表的基本操作，包含单链表的创建，删除，插入，逆置，合并等，适合初学者。-Data structures, basic operations of a single chain, including creation of a single list, delete, insert, reverse position, merger, etc., suitable for beginners.