编写一个C语言程序，输入n个学生的学号和成绩（有1位小数），按成绩从高到低排序输出，n 小于50，学号小于10位。（要求输出代码包含主函数部分）

以下是一个示例程序，使用冒泡排序对成绩进行从高到低的排序：

#include <stdio.h>
#define MAX_N 50

struct Student {
    char id[11];
    float score;
};

void sort_students(struct Student students[], int n);

int main() {
    int n;
    struct Student students[MAX_N];

    printf("Enter the number of students (n <= 50): ");
    scanf("%d", &n);

    printf("Enter the student ID and score for each student:\n");
    for (int i = 0; i < n; i++) {
        scanf("%s %f", students[i].id, &students[i].score);
    }

    sort_students(students, n);

    printf("Sorted by score:\n");
    for (int i = 0; i < n; i++) {
        printf("%s %.1f\n", students[i].id, students[i].score);
    }

    return 0;
}

void sort_students(struct 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) {
                struct Student temp = students[j];
                students[j] = students[j + 1];
                students[j + 1] = temp;
            }
        }
    }
}

程序首先读入学生人数和每个学生的学号和成绩，然后调用 `sort_students()` 函数对学生按成绩排序，最后输出排好序的学号和成绩。