大家帮帮忙，看看程序为啥报错

程序如下：
#include<stdio.h>
#define N 3
struct Student
    {
        int num;
        char name[20];
        float score[3];
        float aver;
    };
   
   
int main()
{
    void input(struct Student stu[]);
    struct Student max(struct Student stu[]);
    void print(struct Student stud);
    struct Student stu[N],*p=stu,*q;
    input(p);
    q = &(max(p));
    print(*q);
   
    return 0;   
   
   
}

void input(struct Student stu[])
{
    int i;
    printf("请输入各学生的信息：学号、姓名、3门课程成绩：\n");
    for (i=0;i<N;i++)
        {
            scanf("%d %s %f %f %f",&stu[i].num,stu[i].name,&stu[i].score[0],
            &stu[i].score[1],&stu[i].score[2]);
            stu[i].aver = (stu[i].score[0]+stu[i].score[1]+stu[i].score[2])/3.0;
        }
}


struct Student max(struct Student stu[])
{
    int i,m=0;
    for(i=0;i<N;i++)
        {
            if (stu[i].aver>stu[m].aver)
                {
                    m = i;
                }
            }   
    return (stu[m]);
   
}

void print(struct Student stud)
{
    printf("\n成绩最高的学生是：\n");
    printf("学号：%d\n姓名：%s\n三门课成绩：%5.1f,%5.1f,%5.1f\n平均成绩：%6.2f\n",
            stud.num,stud.name,stud.score[0],stud.score[1],stud.score[2],stud.aver);
}

以上程序的第19行报错，[Error] lvalue required as unary '&' operand
不知道是什么问题，请朋友们帮忙看看