qwe/b4.c

#include <stdio.h>
#include <stdlib.h>

 struct Student {
    int id;        
    int classNum;   
    float score1;   
    float score2;   
    float score3;   
} Student;

int compareStudents( struct Student studentA,  struct Student studentB)
    {
    if (studentA.classNum < studentB.classNum) {
        return -1;
    } else if (studentA.classNum > studentB.classNum) {
        return 1;
    } else {
        float totalScoreA = studentA.score1 + studentA.score2 + studentA.score3;
        float totalScoreB = studentB.score1 + studentB.score2 + studentB.score3;
        if (totalScoreA > totalScoreB) {
            return -1;
        } else if (totalScoreA < totalScoreB) {
            return 1;
        } else {
            return 0;
        }
    }
}

int main() {
    struct Student students[4];
    students[0].id = 10001;
    students[0].classNum = 11;
    students[0].score1 = 99.5;
    students[0].score2 = 88.5;
    students[0].score3 = 89.5;

    students[1].id = 10002;
    students[1].classNum = 12;
    students[1].score1 = 77.9;
    students[1].score2 = 56.5;
    students[1].score3 = 87.5;

    students[2].id = 10003;
    students[2].classNum = 11;
    students[2].score1 = 92.5;
    students[2].score2 = 99.0;
    students[2].score3 = 60.5;

     struct Student newStudent;
    
    scanf("%d %d %f %f %f", &newStudent.id, &newStudent.classNum, &newStudent.score1, &newStudent.score2, &newStudent.score3);

    int isExist = 0;
    int i;
    for (i = 0; i < 3; i++) {
        if (newStudent.id == students[i].id) {
            isExist = 1;
            break;
        }
    }
    if (isExist) {
        printf("id had exsited");
        printf("%d %d %.1f %.1f %.1f\n", students[0].id, students[0].classNum, students[0].score1, students[0].score2, students[0].score3);
        return 0;
    }

    students[3] = newStudent;
    qsort(students, 4, sizeof(Student), compareStudents);

    for (i = 0; i < 4; i++) {
        printf("%d %d %.1f %.1f %.1f", students[i].id, students[i].classNum, students[i].score1, students[i].score2, students[i].score3);
        if (students[i].id == newStudent.id) {
            printf(" inserted\n");
        } else {
            printf("\n");
        }
    }

    return 0;
}