如果链表程序的主函数中只调用creat函数，为什么在运行的时候输入第一个数据的时候会自动退出？？
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
#define NULL 0
#define LEN sizeof(struct student)

//创建一个链表
struct student
{
 long num;
 float score;
 struct student *next;
};
int n;
struct student *creat(void)
{
 struct student *head;
 struct student *p1,*p2;
 n=0;
 p1=p2=(struct student *)malloc(LEN);
 scanf("%ld,%lf",&p1->num,&p1->score);
 head=NULL;
 while(p1->num!=0)
 {
  n=n+1;
  if(n==1)head=p1;
  else p2->next=p1;
  p2=p1;
  p1=(struct student *)malloc(LEN);
  scanf("%ld,%f",&p1->num,&p1->score);
 }
 p2->next=NULL;
 return(head);
}

void print(struct student *head)
{
 struct student *p;
 printf("\nNow,These %d records are:\n",n);
 p=head;
 if(head!=NULL)
  do
  {
            printf("%ld %5.2f\n",p->num,p->score);
            p=p->next;
  }while(p!=NULL);
}

//删除节点的函数
struct student *del(struct student *head,long num)
{
 struct student *p1,*p2;
 if(head==NULL)
 {
  printf("\nlist null!\n");
  goto end;
 }
 
 p1 = head;
 
 while(num!=p1->num&&p1->next!=NULL)
 {
  p2=p1;
  p1=p1->next;
 }

 if(num==p1->num)
 {
  if(p1==head)
   head=p1->next;
  else
   p2->next=p1->next;
  printf("delete:%d\n",num);
  n=n-1;
  free(p1);
 }
 else
  printf("%ld not been found!\n",num);

end: return (head);   
}

//对链表的插入操作
struct student *insert(struct student *head,struct student *stud)
{
 struct student *p0,*p1,*p2;
 p1=head;
 p0=(struct student *)malloc(LEN);
 memcpy(p0, stud, LEN);
 if(head==NULL)
 {head=p0;p0->next=NULL;}
 else
 {
  while((p0->num>p1->num)&&(p1->next!=NULL))
  {
   p2=p1;
   p1=p1->next;
  }
  if(p0->num <= p1->num)
  {
   if(head==p1)
    head=p0;
   else
    p2->next=p0;
   p0->next=p1;
  }
  else
  {
   p1->next=p0;
   p0->next=NULL;
  }
 }
 n=n+1;
 return(head);
}

void clear(struct student *head)
{
 struct student *p = head;

 while (p != NULL)
 {
  head = p->next;
  free(p);
  p = head;
 }
}

main()
{
 struct student *head;
 printf("input records:\n");
 head=creat();
 print(head);
 getch();
}

--!!怎么没有人回的

lz怎么输入的
scanf("%ld,%lf",&p1->num,&p1->score);
这条语句里%lf要改成%f，否则score数据会错误，不过这不会造成lz所说的错误

原来不是程序的问题，是用WINTC编译才这样的，用VC++编是没有问题的，唉，卡在这里两天了