求大神帮我看下这段程序，运行到“输入第二个学生姓名”就崩溃了。

Question

#include
#include
struct student
{
int age;
char name[40];
float score;
};

void intput(struct student **st, int len);
void output(struct student **st, int len);

int main (void)
{
int len;
printf("请输入学生人数：");
scanf("%d", &len);
struct student * st = (struct student*)malloc(sizeof(struct student) * len);
intput(&st, len);
output(&st, len);

return 0;

}

void intput(struct student **st, int len)
{
int i;
for (i=0; i {
printf("请输入第%d个人的姓名：", i+1);
scanf("%s", &st[i]->name);
printf("请输入第%d个人的年龄：", i+1);
scanf("%d", &st[i]->age);
printf("请输入第%d个人的分数：", i+1);
scanf("%f", &st[i]->score);
}
}

void output(struct student **st, int len)
{
int i;
for (i=0; i {
printf("第%d个人的信息:\n", i+1);
printf("姓名：%s\n", st[i]->name);
printf("年龄：%d\n", st[i]->age);
printf("分数：%f\n", st[i]->score);
}
}

Answer 1

这程序没必要用到二级指针吧？intput(st,len);这样不是很好么？