这个代码哪里错了啊？为什么Visual C++运行不起啊？

#include<stdio.h>
#include<malloc.h>
#include<assert.h>
#define N 5
struct Student
{
int num;
char name[20];
double score[3];
};

Student* Input(Student* Stu, int len)
{
assert(Stu != NULL);
printf("请输入学生信息，编号 姓名 课程1成绩，课程2成绩，课程3成绩\n");
for (int i = 0; i < len; i++)
{
scanf_s("%d %s", &Stu[i].num, &Stu[i].name, 20);
for (int j = 0; j < 3; j++)
{
scanf_s("%lf", &Stu[i].score[j]);
}

}
return Stu;
}
void Print(Student* Stu, int len)
{
int count = 0;
double tmp = 0;
double max = 0;
double tmp1 = 0;
double tmp2 = 0;
double tmp3 = 0;
double* arr = (double*)malloc(sizeof(double) * len);
double* brr = (double*)malloc(sizeof(double) * len);
double* crr = (double*)malloc(sizeof(double) * len);
double* drr = (double*)malloc(sizeof(double) * len);
for (int i = 0; i < len; i++)
{
tmp1 += Stu[i].score[0];
tmp2 += Stu[i].score[1];
tmp3 += Stu[i].score[2];
for (int j = 0; j < 3; j++)
{
tmp += Stu[i].score[j];
}
arr[i] = tmp;
tmp = 0;
}
for (int i = 0; i < len; i++)
{
if (max < arr[i])
{
max = arr[i];
count = i;
}
}
tmp1 = tmp1 / len;
tmp2 = tmp2 / len;
tmp3 = tmp3 / len;
printf("课程1平均成绩:%f 课程2平均成绩: %f 课程3平均成绩: %f\n", tmp1, tmp2, tmp3);
printf("最高分学生数据为: %d %s ", Stu[count].num, Stu[count].name);
for (int i = 0; i < 3; i++)
{
printf("%f ", Stu[count].score[i]);
}
printf("%f\n", max/3);

//释放动态内存
free(arr);
free(brr);
free(crr);
free(drr);
}
int main()
{
Student Stu1[N] = { 0 };
Input(Stu1, (sizeof(Stu1) / sizeof(Stu1[0])));
Print(Stu1, (sizeof(Stu1) / sizeof(Stu1[0])));

return 0;
}

修改如下，供参考：

#include<stdio.h>
#include<malloc.h>
#include<assert.h>
#define N 5     //人数
#define M 3     //课程数
struct Student{
    int  num;
    char name[20];
    double score[M];
};

void Input(Student* Stu, int len) //Student* Input(Student* Stu, int len)
{
    int i,j;
    printf("请输入学生信息，编号 姓名  %d门课程成绩\n",M);//课程1成绩，课程2成绩，课程3成绩\n");
    for (i = 0; i < len; i++)
    {
        scanf("%d %s", &Stu[i].num, Stu[i].name);
        for (j = 0; j < M; j++)
        {
             scanf("%lf", &Stu[i].score[j]);
        }
    }
}
void Print(Student* Stu, int len)
{
    int    i,j,count=0;
    double tmp = 0;
    double max = 0;
    double tmp1 = 0;
    double tmp2 = 0;
    double tmp3 = 0;
    for (i = 0; i < len; i++)
    {
        tmp1 += Stu[i].score[0];
        tmp2 += Stu[i].score[1];
        tmp3 += Stu[i].score[2];
        for (j = 0; j < M; j++)
        {
            tmp += Stu[i].score[j];
        }
        if (max < tmp)
        {
            max = tmp;
            count = i;
        }
        tmp = 0;
    }
    tmp1 = tmp1 / len;
    tmp2 = tmp2 / len;
    tmp3 = tmp3 / len;
    printf("课程1平均成绩:%.2f 课程2平均成绩: %.2f 课程3平均成绩: %.2f\n", tmp1, tmp2, tmp3);
    printf("最高分学生数据为: %d %s ", Stu[count].num, Stu[count].name);
    for (i = 0; i < M; i++)
    {
        printf("%.2f ", Stu[count].score[i]);
    }
    printf("%.2f\n", max/M);
}
int main()
{
    Student Stu1[N] = { 0 };
    //Input(Stu1, (sizeof(Stu1) / sizeof(Stu1[0])));
    Input(Stu1, N);
    //Print(Stu1, (sizeof(Stu1) / sizeof(Stu1[0])));
    Print(Stu1, N);
    return 0;
}