123-a/作业2.6.c

#include <stdio.h>
#include <stdlib.h> // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> qsort <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD>
#include <string.h> // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD>ļ<EFBFBD>

// ѧ<><D1A7><EFBFBD><EFBFBD>Ϣ<EFBFBD>Ľṹ<C4BD><E1B9B9>
struct Student {
    int student_id;
    int class_id;
    char name[50];
    float score1;
    float score2;
    float score3;
};

// <20>ȽϺ<C8BD><CFBA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
int compareStudents(const void *a, const void *b) {
    struct Student *student1 = (struct Student *)a;
    struct Student *student2 = (struct Student *)b;

    if (student1->class_id != student2->class_id) {
        return student1->class_id - student2->class_id;
    } else {
        float total_score1 = student1->score1 + student1->score2 + student1->score3;
        float total_score2 = student2->score1 + student2->score2 + student2->score3;
        return total_score2 - total_score1;
    }
}

int main() {
    struct Student students[100];
    int num_students = 3;  // <20><>ʼ<EFBFBD><CABC>3<EFBFBD><33>ѧ<EFBFBD><D1A7><EFBFBD><EFBFBD>Ϣ

    // <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD><EFBFBD>Ϣ
    students[0] = (struct Student){10001, 11, "Zhang", 99.5, 88.5, 89.5};
    students[1] = (struct Student){10002, 12, "Yang", 77.9, 56.5, 87.5};
    students[2] = (struct Student){10003, 11, "Liang", 92.5, 99.0, 60.5};

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD><EFBFBD>Ϣ<EFBFBD><CFA2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    qsort(students, num_students, sizeof(struct Student), compareStudents);

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸<EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ
    struct Student modified_student;
    printf("<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޸<EFBFBD>ѧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD>ѧ<EFBFBD><EFBFBD> <20>༶ <20><><EFBFBD><EFBFBD> <20>ɼ<EFBFBD>1 <20>ɼ<EFBFBD>2 <20>ɼ<EFBFBD>3<EFBFBD><33><EFBFBD><EFBFBD>");
    scanf("%d %d %s %f %f %f", &modified_student.student_id, &modified_student.class_id, modified_student.name, &modified_student.score1, &modified_student.score2, &modified_student.score3);

    // <20><><EFBFBD><EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD>ڣ<EFBFBD><DAA3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><DAA3><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><D4AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD><EFBFBD>Ϣ<EFBFBD><CFA2><EFBFBD>˳<EFBFBD><CBB3><EFBFBD><EFBFBD><EFBFBD>
    int found = 0;
    for (int i = 0; i < num_students; i++) {
        if (modified_student.student_id == students[i].student_id) {
            found = 1;
            students[i] = modified_student;
            break;
        }
    }

    if (!found) {
        printf("<EFBFBD><EFBFBD>ѧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>\n");
        for (int i = 0; i < num_students; i++) {
            printf("%d %d %s %.1f %.1f %.1f\n", students[i].student_id, students[i].class_id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
        }
        return 0;
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݽ<EFBFBD><DDBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    qsort(students, num_students, sizeof(struct Student), compareStudents);

    // <20><><EFBFBD><EFBFBD>ѧ<EFBFBD><D1A7><EFBFBD><EFBFBD>Ϣ
    for (int i = 0; i < num_students; i++) {
        if (i == 0 || students[i].class_id != students[i - 1].class_id) {
            printf("%d %d %s %.1f %.1f %.1f", students[i].student_id, students[i].class_id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
        } else {
            printf("   %d %s %.1f %.1f %.1f", students[i].student_id, students[i].name, students[i].score1, students[i].score2, students[i].score3);
        }

        if (i == num_students - 1) {
            printf(" modified\n");
        } else {
            printf("\n");
        }
    }

    return 0;
}