帮忙看看链表！
#include <stdio.h>
#include <malloc.h>
#define LEN sizeof(struct student)
struct student{
int number;
int score[3];

struct student *next;
};
struct student *creat(struct student *head)
{
struct student *p1,*p2;
printf( "qingshuruxueshengshuju:\n ");
p1=(struct student*)malloc(sizeof(LEN));
if (p1==NULL)printf( "memory error:\n ");
scanf( "%d%d%d%d ",&p1-> number,&p1-> score[0],&p1-> score[1],&p1-> score[2]);
p1-> next=NULL;
if (head==NULL)return p1;
else
{
p2=head;
while(p2-> next!=NULL)p2=p2-> next;
p2-> next=p1;

return head;
}

}
void print(struct student *head)
{
struct student *p1;
p1=head;
while(p1!=NULL)
{
printf( "%d %d %d %d\n ",p1-> number,p1-> score[0],p1-> score[1],p1-> score[2]);
p1=p1-> next;
}
}
main()
{ int i;
struct student *head=NULL;
for (i=0;i <5;i++)
head=creat(head);
print(head);
getch();
}


为什么会循环不下去！

[解决办法]
p1=(struct student*)malloc(sizeof(LEN));
~~~~~~~~~~~~~~?
[解决办法]

struct student *creat(struct student *head)
{
struct student *p1,*p2;
printf( "qingshuruxueshengshuju:\n ");
p1=(struct student*)malloc(sizeof(LEN));
if (p1==NULL)printf( "memory error:\n ");//此处既然分配失败就的返回，或者跑出异常，或者重新分配。
scanf( "%d%d%d%d%s%s%s ",&p1-> number,&p1-> score[0],&p1-> score[1],&p1-> score[2],p1-> name,p1-> sex,p1-> class);//在字符串结束后要加上结束符，不然肯定会出现乱码。

p1-> next=NULL;
if (head==NULL)return p1;
else
{
p2=head;
while(p2-> next!=NULL)p2=p2-> next;
p2-> next=p1;

return head;
}

}

void main()
{
int i;
struct student *head=NULL;
for (i=0; i <5; i++)
head=creat(head);
print(head);
getch();
}

ps 从效率上来说你问什么不在头结点处插入呢，