用C语言对10个学生信息按成绩进行降序排序

好的，这里提供一种基于快速排序算法的实现方式：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct student {
    char name[20];
    int score;
};

void swap(struct student *a, struct student *b) {
    struct student tmp = *a;
    *a = *b;
    *b = tmp;
}

int partition(struct student array[], int left, int right) {
    int pivot = array[right].score;
    int i = left - 1;
    for (int j = left; j < right; j++) {
        if (array[j].score >= pivot) {
            i++;
            swap(&array[i], &array[j]);
        }
    }
    swap(&array[i+1], &array[right]);
    return i+1;
}

void quick_sort(struct student array[], int left, int right) {
    if (left < right) {
        int pivot_index = partition(array, left, right);
        quick_sort(array, left, pivot_index-1);
        quick_sort(array, pivot_index+1, right);
    }
}

int main() {
    struct student stu[10] = {
        {"Alice", 90},
        {"Bob", 80},
        {"Charlie", 70},
        {"David", 60},
        {"Emily", 50},
        {"Frank", 40},
        {"Grace", 30},
        {"Henry", 20},
        {"Ivy", 10},
        {"Jack", 0},
    };

    quick_sort(stu, 0, 9);

    printf("按成绩降序排列后的结果：\n");
    for (int i = 0; i < 10; i++) {
        printf("%s %d\n", stu[i].name, stu[i].score);
    }

    return 0;
}

以上代码实现了对10个学生信息按照成绩进行降序排序，使用了快速排序算法。