// 获取学生总分 void get_total_score(Student *student) { int total = 0; for (int i = 0; i < MAX_COURSE_NUM; i++) { student->total_score = total; } } // 显示学生信息 int show_student_info( Student *student) { printf("学号：%d\t姓名：%s\t成绩：%d %d %d\t总分：%d\n",student->id, student->name,student->scores[0], student->scores[1], student->scores[2],student->total_score); } // 显示所有学生信息及总排名 void show_all_students(Student *student) { // 计算总分 for (int i = 0; i < student_count; i++) { students[i].total_score = get_total_score(&students[i]); } // 排序 for (int i = 0; i < student_count - 1; i++) { for (int j = i + 1; j < student_count; j++) { if (students[i].total_score < students[j].total_score) { Student temp = students[i]; students[i] = students[j]; students[j] = temp; } } } // 显示信息 printf("\n所有学生信息及总排名：\n"); for (int i = 0; i < student_count; i++) { show_student_info(&students[i]); } }哪错了

在函数 get_total_score 中，你每次循环都将总分赋值为0，然后又用循环内的最后一个分数覆盖了总分，所以每个学生的总分都是最后一个分数。应该在循环结束后再将总分赋值给学生。

修改后的代码如下：

void get_total_score(Student *student) {
    int total = 0;
    for (int i = 0; i < MAX_COURSE_NUM; i++) {
        total += student->scores[i];
    }
    student->total_score = total;
}

int show_student_info(Student *student) {
    printf("学号：%d\t姓名：%s\t成绩：%d %d %d\t总分：%d\n", student->id, student->name,
           student->scores[0], student->scores[1], student->scores[2], student->total_score);
}

void show_all_students(Student *students) {
    // 计算总分
    for (int i = 0; i < student_count; i++) {
        get_total_score(&students[i]);
    }
    // 排序
    for (int i = 0; i < student_count - 1; i++) {
        for (int j = i + 1; j < student_count; j++) {
            if (students[i].total_score < students[j].total_score) {
                Student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
    // 显示信息
    printf("\n所有学生信息及总排名：\n");
    for (int i = 0; i < student_count; i++) {
        show_student_info(&students[i]);
    }
}