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结构体指针 去结构体成员属性 用 ->
链域 === next域
如果有头结点 *L 表示头结点
L 表示头指针
对转载文章的 剖析
current = (*L) -> next a1
pnext = current -> next a2
因为第一个结点最后反转 完毕 肯定是 尾结点
while (pnext) <=> while (a2)
(a2)
prev =pnext -> next a3
(a2) (a1)
pnext -> next = current a1
current = next (a2)
pnext = prev (a3)
① a2 -> a1 current a2
② a3 -> a2 -> a1 current a3
③ a4 -> a3 ->a2 -> a1 current a4
(*L) -> next = a4