张智伟+2302580059

[13859317221]

#include <stdio.h>

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;

}