struct node
{
    int num;
    struct *next;
}
struct node *head1,*head2;
请问如何删除head1和head2中num相同的节点
head1中所有节点的num值都不同
head2中所有节点的num值也不同

这个网址你看看吧，会对你有帮助的： http://

学习中
不错

贴个经典的双链表
#ifndef _LIST_H
#define _LIST_H 1

/* The definitions of this file are adopted from those which can be
   found in the Linux kernel headers to enable people familiar with
   the latter find their way in these sources as well.  */


/* Basic type for the double-link list.  */
typedef struct list_head
{
  struct list_head *next;
  struct list_head *prev;
} list_t;


/* Define a variable with the head and tail of the list.  */
#define LIST_HEAD(name) \
  list_t name = { &(name), &(name) }

/* Initialize a new list head.  */
#define INIT_LIST_HEAD(ptr) \
  (ptr)->next = (ptr)->prev = (ptr)


/* Add new element at the head of the list.  */
static inline void
list_add (list_t *newp, list_t *head)
{
  head->next->prev = newp;
  newp->next = head->next;
  newp->prev = head;
  head->next = newp;
}


/* Add new element at the tail of the list.  */
static inline void
list_add_tail (list_t *newp, list_t *head)
{
  head->prev->next = newp;
  newp->next = head;
  newp->prev = head->prev;
  head->prev = newp;
}


/* Remove element from list.  */
static inline void
list_del (list_t *elem)
{
  elem->next->prev = elem->prev;
  elem->prev->next = elem->next;
}


/* Join two lists.  */
static inline void
list_splice (list_t *add, list_t *head)
{
  /* Do nothing if the list which gets added is empty.  */
  if (add != add->next)
    {
      add->next->prev = head;
      add->prev->next = head->next;
      head->next->prev = add->prev;
      head->next = add->next;
    }
}


/* Get typed element from list at a given position.  */
#define list_entry(ptr, type, member) \
  ((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))



/* Iterate forward over the elements of the list.  */
#define list_for_each(pos, head) \
  for (pos = (head)->next; pos != (head); pos = pos->next)


/* Iterate forward over the elements of the list.  */
#define list_for_each_prev(pos, head) \
  for (pos = (head)->prev; pos != (head); pos = pos->prev)


/* Iterate backwards over the elements list.  The list elements can be
   removed from the list while doing this.  */
#define list_for_each_prev_safe(pos, p, head) \
  for (pos = (head)->prev, p = pos->prev; \
       pos != (head); \
       pos = p, p = pos->prev)

#endif  /* list.h */

楼主是想要带头结点的单链表，还是无头结点（仅有头指针）的单链表。这两种类型的代码是不一样的！