#include "stdio.h"
#include "malloc.h"
 struct node
{
    int data;
    struct node *next;
};

struct node * creat(void)
{
  struct node *p1,*p2,*head;
  p2=p1=(struct node *)malloc(sizeof(struct node));
  scanf("%d",&p1->data);
  head=p1;
  while(p1->data!=NULL)
  {
    p1=(struct node *)malloc(sizeof(struct node));
    scanf("%d",&p1->data);
    p2->next=p1;
    p2=p1;
   }
    p2->next=NULL;
   return(head);
  }
struct node * print(struct node *head)
{
  struct node  *p; int sum=0;
  printf("the data of the list are:\n");
  p=head;
  while(p->next!=NULL)
  {
    printf("%d ",p->data);
    p=p->next;sum++;
  }
}
struct node * connect(struct node *hx,struct node *hy)
{
  struct node *p,*hz;
  p=hx;
  while(p->next!=NULL)
  p=p->next;
  p->next=hy;
  hz=hx;
  return(hz);
  }
main()
{
  struct node *hx,*hy,*hz;
  printf("please enter the data of X");
  hx=creat();
  print(hx);
  printf("please enter the data of Y");
  hy=creat();
  print(hy);
  hz=connect(hx,hy);
  print(hz);
}

上次的问题解决了，您太强了