5-1 单链表逆转

下列代码的功能是返回带头结点的单链表L的逆转链表。

List Reverse( List L )
{
    Position Old_head, New_head, Temp;
    New_head = NULL;
    Old_head = L->Next;

    while ( Old_head )  {
        Temp = Old_head->Next;
        Old_head->Next=New_head;  \\
        New_head = Old_head;  
        Old_head = Temp; 
    }
    L->Next=New_head;\\
    return L;
}