求指导，如何给链表排序，顺便帮我看看这段代码错哪儿了，VC总是提示有空串
谢谢啦

#include<stdio.h>
#include<stdlib.h>
#define len sizeof(struct student)
struct student
{
    char name[30];
    int score1;
    int score2;
    int score3;
    int all;
    struct student *next;
};
int n;
struct student*creat()
{
    struct student*head;
    struct student*p1,*p2; n=0;
    p1=p2=(struct student*)malloc(len);
    scanf("%s%d%d%d",&p1->name,&p1->score1,&p1->score2,&p1->score3);
    head=NULL;
     
    while(p1->name!='')
    {  
        n=n+1;  
        if(n==1)head=p1;  
        else p2->next=p1;  
        p2=p1;  
        p1=(struct student*)malloc(len);  
        scanf("%s%d%d%d",&p1->name,&p1->score1,&p1->score2,&p1->score3);
    }
    p2->next=NULL;
    return(head);
}
int main()
{
    struct student*pt;
    pt=creat();
    printf("总评1：%d",pt->all=(pt->score1+pt->score2+pt->score3));
    printf("总评2：%d",pt->next->all=(pt->next->score1+pt->next->score2+pt->next->score3));
    printf("总评3：%d",pt->next->next->all=(pt->next->next->score1+pt->next->next->score2+pt->next->next->score3));
 }

怎么不是了？

弱弱的问一句 strucdt student *p1,*p2;n=0;这段代码有什么问题吗？