报错了怎么改333333

 
//test03
#include <stdio.h>
#include <stdlib.h>
 
struct student {
    int   sno;
    char  name[20];
    float scores[3];
    float average;
    float sum;
};
 
struct NODE {
    struct student data;
    struct NODE    *next;
};
 
int main() {
    int num = 0;
    printf("please input the number of students: ");
    scanf("%d", &num);
    fflush(stdin);
    printf("please input the student's information: \n");
    struct NODE *head = NULL;
 
    for (int i = 0; i < num; ++i) {
        struct NODE *tmp = malloc(sizeof(struct NODE));
        if (tmp == NULL) {
            printf("malloc failed!\n");
            return -1;
        }
        scanf(
                "%d %s %f %f %f",
                &tmp->data.sno,
                tmp->data.name,
                &tmp->data.scores[0],
                &tmp->data.scores[1],
                &tmp->data.scores[2]
        );
        if (tmp->data.sno > 99999999) {
            printf("sno is too long!\n");
            return -1;
        } else if (tmp->data.sno < 10000000) {
            printf("sno is too short!\n");
            return -1;
        }
        tmp->data.sum     = tmp->data.scores[0] + tmp->data.scores[1] + tmp->data.scores[2];
        tmp->data.average = tmp->data.sum / 3;
        if (head == NULL || tmp->data.sum > head->data.sum) {
            tmp->next = head;
            head = tmp;
        } else {
            //插入时按总分从大到小排序
            struct NODE *p = head;
            while (tmp->data.sum <= p->data.sum && p->next != NULL) {
                p = p->next;
            }
            tmp->next = p->next;
            p->next   = tmp;
        }
    }
 
    FILE *fp = fopen("student.dat", "wb+");
    if (fp == NULL) {
        printf("File open failed!\n");
        return -1;
    }
    struct NODE *p = head;
    while (p != NULL) {
        fwrite(&p->data, sizeof(struct student), 1, fp);
        printf(
                "%d %s %.2f %.2f %.2f %.2f %.2f\n",
                p->data.sno,
                p->data.name,
                p->data.scores[0],
                p->data.scores[1],
                p->data.scores[2],
                p->data.sum,
                p->data.average
        );
        p = p->next;
    }
 
    return 0;
}
![img](https://img-mid.csdnimg.cn/release/static/image/mid/ask/735360040386169.png "#left")
 

malloc 前面强转一下

(struct NODE*)malloc