#include<stdio.h>
#include<stdlib.h>
struct cell
{
  int element;
  struct cell *next;
};
//函数的宣言
...
main()
....
/*将x代入p指向的cell的下一个cell，list从init开始*/
struct cell *insert(int x, struct cell *p,struct cell *init)
{
  struct cell *q,*r;
  r=(struct cell *)malloc(sizeof(struct cell));
  if(p==NULL)
   {
    q=init;
    init=r;
   }
  else
   {
    q=p->next;
    p->next=r;
   }
   r->element=x;
   r->next=q;

  return (init);
}

/*在从init开始的list中，将p指向的cell的下一个cell删除*/
struct cell *delete(struct cell *p,struct cell *init)
{
  struct cell *q;
  if(init==NULL)
    {
      printf("Error: List is empty.\n");
     exit(1);
    }
  if(p==NULL)
   {
     q=init;
     init=init->next;
     free(q);
   }
else
  {
    if(p->next==NULL)
      {
        printf("Error: No element to remove.\n");
        exit(1);
      }
    else
      {
        q=p->next;
        p->next=q->next;
        free(q);
      }
  }

return init;
}