123/4

#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
struct Student {
    char student_id[6];
    int class_number;
    float score1, score2, score3;
};

int compare_students(const void *a, const void *b) {
    struct Student *student1 = (struct Student *)a;
    struct Student *student2 = (struct Student *)b;

    if (student1->class_number < student2->class_number) {
        return -1;
    } else if (student1->class_number > student2->class_number) {
        return 1;
    } else {

        float total1 = student1->score1 + student1->score2 + student1->score3;
        float total2 = student2->score1 + student2->score2 + student2->score3;
        
        if (total1 < total2) {
            return 1;
        } else if (total1 > total2) {
            return -1;
        } else {
            return 0;
        }
    }
}

int main() {
    struct Student students[4];
    int i;

    strcpy(students[0].student_id, "10001");
    students[0].class_number = 11;
    students[0].score1 = 99.5;
    students[0].score2 = 88.5;
    students[0].score3 = 89.5;

    strcpy(students[1].student_id, "10002");
    students[1].class_number = 12;
    students[1].score1 = 77.9;
    students[1].score2 = 56.5;
    students[1].score3 = 87.5;

    strcpy(students[2].student_id, "10003");
    students[2].class_number = 11;
    students[2].score1 = 92.5;
    students[2].score2 = 99.0;
    students[2].score3 = 60.5;

    int num_students = 3; 

    struct Student new_student;
    printf("请输入新学生的信息 (学号 班级 成绩1 成绩2 成绩3): ");
    scanf("%s %d %f %f %f", new_student.student_id, &new_student.class_number, &new_student.score1, &new_student.score2, &new_student.score3);

    bool student_exists = false;
    for (i = 0; i < num_students; i++) {
        if (strcmp(new_student.student_id, students[i].student_id) == 0) {
            student_exists = true;
            break;
        }
    }

    if (student_exists) {
        printf("已存在学号的信息\n");
    } else {

        students[num_students] = new_student;
        num_students++;

        qsort(students, num_students, sizeof(struct Student), compare_students);

        for (i = 0; i < num_students; i++) {
            printf("%s %d %.1f %.1f %.1f", students[i].student_id, students[i].class_number, students[i].score1, students[i].score2, students[i].score3);
            if (i == num_students - 1) {
                printf(" inserted\n");
            } else {
                printf("\n");
            }
        }
    }

    return 0;
}