代码如下：

#include <stdio.h>
#include <malloc.h>
void First_Open ();
void Certain_Open ();
void Input (struct student *p);
void Output (struct student *p);
void Connection (struct student *pcurrent,struct student *panaddr);
int Judge ();
void Output (struct student *p);
int N=0;
struct student
{
 int num;
 struct student *next;
}*HEAD,*UNKNOWNADDR;
void main()
{
 int n;
 printf("是否开始创建动态链表 y/n ：");
 n=Judge ();
 if (!n)
 {
  printf("\n未能创建动态链表\n");
 }
 while (n)
 {
  if (n&&!N)
  {
   First_Open ();
   Input (HEAD);
   N++;
  }
  else if (n&&N)
  {
   Certain_Open ();
   Input (UNKNOWNADDR);
   Connection (HEAD,UNKNOWNADDR);
  }
  printf("是否继续创建？ y/n ：");
  n=Judge ();
  if (!n)
  {
   printf("创建结束\n");
   break;
  }
 }
 Output (HEAD);
}
int Judge ()
{
 char temp;
 scanf("%c",&temp);
 if (temp=='y' || temp=='Y')
 {
  return 1;
 }
 else
 {
  return 0;
 }
}
void First_Open ()
{
 HEAD=(struct student*)malloc(sizeof (struct student));
}
void Certain_Open ()
{
 UNKNOWNADDR=(struct student*)malloc(sizeof (struct student));
}
void Input (struct student *p)
{
 printf("请输入学号：");
 scanf("%d",&p->num);
 getchar ();
 p->next=NULL;
}
void Connection (struct student *pcurrent,struct student *panaddr)
{
 struct student *pnext;
 while (pcurrent!=NULL)
 {
  pnext=pcurrent->next;
  if (panaddr->num<pcurrent->num && pcurrent==HEAD)
  {
   panaddr->next=HEAD;
   HEAD=panaddr;
   break;
  }
  else if (panaddr->num>pcurrent->num && panaddr->num<pnext->num)
  {
   pcurrent->next=panaddr;
   panaddr->next=pnext;
   break;
  }
  else if (pcurrent->next == NULL)
  {
   pcurrent->next=panaddr;
  }
  pcurrent=pcurrent->next;
 }
}
void Output (struct student *p)
{
 while (p!=NULL)
 {
  printf("学号：");
  printf("%d ",p->num);
  p=p->next;
  printf("\n");
 }
}

 关于插入功能，有点问题，为什么每次当输入完第一个结点后，若继续创建，不能输入大于当前链表内的任意结点。错误提示：access violation （访问冲突)。