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include

include

typedef struct { int id; float score; } Student; //定义一个Student结构体,包含学号(id)和考试成绩(score)两个成员

void input_students(Student* students, int n) { for (int i = 0; i < n; i++) { printf("请输入第%d个学生的学号: ", i + 1); scanf("%d", &students[i].id); printf("请输入%d的考试成绩: ", students[i].id); scanf("%f", &students[i].score); } }

void sort_students(Student* students, int n) { for (int i = 0; i < n - 1; i++) { for (int j = 0; j < n - i - 1; j++) { if (students[j].score < students[j + 1].score) { Student temp = students[j]; students[j] = students[j + 1]; students[j + 1] = temp; } } } }

float calculate_avg_score(Student* students, int n) { float total_score = 0.0; for (int i = 0; i < n; i++) { total_score += students[i].score; } return total_score / n; }

int count_failed_students(Student* students, int n) { int failed_count = 0; for (int i = 0; i < n; i++) { if (students[i].score < 60.0) { failed_count++; } } return failed_count; }

//定义四个函数:input_students()用于输入学生信息, sort_students()用于对学生成绩排序, calculate_avg_score()用于计算平均成绩, count_failed_students()用于统计不及格人数。

int main() { int n; printf("请输入学生人数: "); //在main()函数中,首先输入学生人数n。 scanf("%d", &n);

Student* students = (Student*)malloc(n * sizeof(Student));  //动态分配一个Student类型的数组students来存储学生信息

input_students(students, n);//调用input_students()函数输入每个学生的学号和考试成绩。
sort_students(students, n);//调用sort_students()函数对学生成绩进行排序(使用冒泡排序算法)。

printf("\n学号\t成绩\n");
for (int i = 0; i < n; i++) {
    printf("%d\t%.2f\n", students[i].id, students[i].score);//输出学生的学号和成绩,按从高到低的顺序。
}

float avg_score = calculate_avg_score(students, n);//调用calculate_avg_score()函数计算平均成绩,调用count_failed_students()函数统计不及格人数。
int failed_count = count_failed_students(students, n);

printf("\n平均成绩: %.2f\n", avg_score);
printf("不及格人数: %d\n", failed_count);//输出平均成绩和不及格人数

free(students);//释放动态分配的内存。
return 0;

}