关于链表建立问题,程序出错,想了好久拉,但不知道在哪,请大家帮忙,

#include <stdlib.h>
#include <stdio.h>
#define NuLL 0
#define LEN sizeof(struct student)
struct student
{long number;
  float score;
  struct student *next;
};
int n;

struct student *creat(void)
{ struct student *P1,*p2;
   struct student *head;
   n=0;
   p1=p2=(struct student *)malloc(LEN);
   scanf("%ld,%f",&p1->number,&p1->score);
   head=NULL;
   while (p1->number!=0)
   {n=n+1;
   if (n==1) head=p1;
   else p2->next=p1;
    p2=p1;
    p1=(struct student *)malloc(LEN);
    scanf("%ld,%f",&p1->number,&p1->score);
   }
    p2->next=NULL;
    return(head);

}

void print(struct student *head)
{
struct student *p;
p=head;
if (head!=NULL)
     do
     {printf("%ld,%f",p->number,p->score);
      p=p->next;

     }while(p!=NULL);
}

int main(void)
{struct student *head;
  head=creat();
  print(head);
}

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编译老出错，不知道为啥，感觉没什么问题啊，麻烦指点下

……
struct student *creat(void)
{ struct student *P1,*p2;  //这里的p1应该是小写！
……

十分感谢楼上的帮忙,虽然很简单,但对我来说不容易发现错误,呵呵