#include <stdio.h>
#include <stdlib.h>
#define LEN sizeof(struct student)
struct student
{long num;
char name[20];
float score[3];
struct student *next;};

void main()                      //主函数
{struct student *stu;
struct student *shuru();
void chuli(struct student *p);
void shuchu(struct student *p);
stu=shuru();
chuli(stu);
shuchu(stu);}

struct student *shuru()          //输入函数
{ struct student *head,*p1,*p2;  int n;
   p1=p2=(struct student*)malloc(LEN);
   scanf("%ld,%s,%f,%f,%f",&p1->num,p1->name,&p1->score[0],&p1->score[1],&p1->score[2]);
   head=NULL;
   for(n=1;n<3;n++)
   {
      if(n==1) head=p1;
      else  p2->next=p1;
      p2=p1;
      p1=(struct student*)malloc(LEN);
      scanf("%ld,%s,%f,%f,%f",&p1->num,p1->name,&p1->score[0],&p1->score[1],&p1->score[2]);
    }
   p2->next=NULL;    return(head);
}

struct student *p1;          //全局变量

void chuli(struct student *p)   //处理函数
{float a=0.0,b;
for(p;p->next!=NULL;p=p->next)
{b=(p->score[0]+p->score[1]+p->score[2])/3.0;
if(a<b) a=b,p1=p;}}

void shuchu(struct student *p)         //输出函数
{for(p;p->next!=NULL;p=p->next)
{printf("%s的平均分是",p->name);
printf("%f\n",(p->score[0]+p->score[1]+p->score[2])/3.0);}
printf("最高分的学生是%s\n",p1->name);}


检测通过，但运行错误，为什么啊？？？？我想了很久的了，哎，求救啊

还是不行

行了，万分感谢！