王建文2302580058

[wanag21]

...c

include

typedef struct { int studentID; float score; } Student;

int compare(const void a, const void b) { Student studentA = (Student )a; Student studentB = (Student )b; if (studentA->score < studentB->score) { return 1; } else if (studentA->score > studentB->score) { return -1; } else { return 0; } }

int main() { int n; // 学生人数 printf("请输入学生人数："); scanf("%d", &n);

Student students[n]; // 学生数组

for (int i = 0; i < n; i++) {
    printf("请输入第%d个学生的学号和成绩：", i + 1);
    scanf("%d%f", &students[i].studentID, &students[i].score);
}

qsort(students, n, sizeof(Student), compare);

printf("按成绩由高到低的顺序输出学生的学号和成绩：\n");
for (int i = 0; i < n; i++) {
    printf("学号：%d，成绩：%.2f\n", students[i].studentID, students[i].score);
}

float sum = 0;
int count = 0;
for (int i = 0; i < n; i++) {
    sum += students[i].score;
    if (students[i].score < 60) {
        count++;
    }
}
float average = sum / n;

printf("平均成绩：%.2f\n", average);
printf("不及格学生人数：%d\n", count);

return 0;

} ...