请问大家这个最简单的动态链表为什么不能正常工作阿？

输入完第一个人的信息以后按回车就总是换到下一行，也无法输入信息，大家能帮帮小弟么？？万分感谢！

#include<stdio.h>
#include<malloc.h>
#define NULL 0
#define LEN sizeof(struct student)

struct student
{
long num;
float score;
struct student *next;
};

int n;

struct student *creat(void)
{

struct student *head,*p1,*p2;
n=0;
p1=p2=(struct student *)malloc(LEN);
scanf("%ld,%f",&p1->num,&p1->score);
head=NULL;
while(p1->num!=999)
{
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,There %d records are:\n",n);
p=head;
if(head!=NULL)
do
{
printf("num=%ld,score=%f\n",p->num,p->score);
p=p->next;
}while(p!=NULL);
}



main()
{
struct student *head;
printf("input records;\n");
head=creat();
print(head);
getch();
}
----------------解决方案--------------------------------------------------------
http://www.bc-cn.net/bbs/dispbbs.asp?boardID=179&ID=71894&page=1
----------------解决方案--------------------------------------------------------