create

struct student * create(void)
{
struct student * head;
struct student * p1,* p2;
n=0;
p1=p2=(struct student *)malloc(LEN);
// scanf("%ld,%f",&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);
}