插入链表问题
如题:insert函数，运行到这个函数输入的时候，输入后出现错误????

C/C++ code

#include <stdio.h>#include <malloc.h>#include <conio.h>#define LEN sizeof(struct student)struct student{    int num;    float score;    struct student *next;};struct student *exproer();            //创建链表函数;void print(struct student *);        //打印链表函数;struct student *del(struct student *, int num);            //删除结点函数;struct student *insert(struct student *head, struct student *stu_2);        //插入结点函数;void main(){    int n = 0;    struct student *stu, *stu_2, *p;    stu = exproer();    p = stu;    print(p);    printf("Please input delete NUM:");    scanf("%d", &n);    print(del(p, n));        printf("Please input insert Number: ");    scanf("%d", &stu_2->num);    printf("Please input insert Score: ");    scanf("%f", &stu_2->score);    p = insert(stu, &stu_2);    print(p);    getch();}struct student *exproer(){    struct student *head, *p1, *p2;    int n = 0;    head = NULL;        p1 = p2 = (struct student *)malloc(LEN);        printf("Please input Number: ");    scanf("%d", &p1->num);    printf("Please input Score: ");    scanf("%f", &p1->score);        while(p1->num)    {        n++;        if(n == 1)        {            head = p1;        }        else        {            p2->next = p1;        }        p2 = p1;        p1 = (struct student *)malloc(LEN);                printf("Please input Number: ");        scanf("%d", &p1->num);        printf("Please input Score: ");        scanf("%f", &p1->score);    }    p2->next = NULL;    return head;}void print(struct student *p){    while(p != NULL)    {        printf("Number = %d\t\tScore = %f\n", p->num, p->score);        p = p->next;    }}struct student *del(struct student *head, int num){    struct student *p1, *p2;        if(head == NULL)    {        printf("Fuck you!!!");        goto END;    }    p1 = head;    while(p1->num != num && p1->next != NULL)    {        p2 = p1;        p1 = p1->next;    }    if(p1->num == num)    {        if(p1 == head)        {            p1 = p1->next;            head = p1;        }        else        {            p2->next = p1->next;        }    }    else    {        printf("Not struct Number!!");    }END:    return head;}struct student *insert(struct student *head, struct student *stu_2){    struct student *p0, *p1, *p2;        p1 = head;    p0 = stu_2;    if(head == NULL)    {        head = p0;        p0->next = NULL;    }    else    {        while((p0->num > p1->num) && (p1->next != NULL))        {                p2 = p1;            p1 = p1->next;        }        if(p0->num <= p1->num)        {            if(head == p1)            //p1是头结点，插入头部;            {                head = p0;            }            else                    //普通情况，插入中间;            {                p2->next = p0;            }            p0->next = p1;        }        else                        //p0最大，插入末尾;        {            p1->next = p0;            p0->next = NULL;        }    }        return head;}

C/C++ code

    stu_2 = (struct student*)malloc(sizeof(struct student*));//stu_2是指针，这儿要初始化分配内存。。。否则出错    p = insert(stu, stu_2);//调用insert参数有问题