请问这条语句错在哪里，
scanf("%ld,%s,%d,%d,%d",&stu->num,&stu->name,&stu->score[0],&stu->score[1],&stu->score[2]);

调试就有错了
error : pointer required on left side of -> in function main.

请大伙帮帮忙啊，急

源码太乱了,就复制片断;
struct student
{
long num;
char name[20];
float score[3];
struct student*next;
};
struct student*head,stu,stud[10]={
{001,"yefu",99,98,100} ,
{002,"wang",39,92,34} ,
{003,"li",59,82,99},
{045,"zhang",89.50,56},
{82,"zhao",82,49,02},
{189,"wu",83,100,40},
{299,"ye",39,83,28},
{323,"shi",83,83,49},
{456,"qing",39,92,92},
{846,"yun",49,21,04}
};