现有10个学生 声明一个浮点数组 通过随机数给10学生赋值分数 1 找到分数最高的学生序号 2 找到10个学生平均分数 3 数组进行由小到大排序 用C语言写出代码

在C语言中，我们可以使用`<stdio.h>`、`<stdlib.h>`和`<time.h>`头文件来进行随机数生成，以及`<float.h>`处理浮点数。下面是一个简单的示例程序，实现了上述需求：

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

#define NUM_OF_STUDENTS 10

void assign_scores(float scores[], int num) {
    srand(time(0)); // 设置随机种子，保证每次运行结果不同
    for (int i = 0; i < num; i++) {
        scores[i] = rand() / (float)(RAND_MAX + 1); // 随机分配[0, 1)之间的浮点数
    }
}

void find_highest_score(float scores[], int num, int* highest_index) {
    *highest_index = 0;
    float max_score = scores[0];
    for (int i = 1; i < num; i++) {
        if (scores[i] > max_score) {
            max_score = scores[i];
            *highest_index = i;
        }
    }
}

float calculate_average(float scores[], int num) {
    float sum = 0;
    for (int i = 0; i < num; i++) {
        sum += scores[i];
    }
    return sum / num;
}

void sort_scores_descending(float scores[]) {
    int i, j;
    float temp;
    for (i = 0; i < NUM_OF_STUDENTS - 1; i++) {
        for (j = 0; j < NUM_OF_STUDENTS - i - 1; j++) {
            if (scores[j] < scores[j+1]) {
                temp = scores[j];
                scores[j] = scores[j+1];
                scores[j+1] = temp;
            }
        }
    }
}

int main() {
    float student_scores[NUM_OF_STUDENTS];
    int highest_score_index;

    assign_scores(student_scores, NUM_OF_STUDENTS);
    
    printf("Highest score is assigned to student %d with a score of %.2f\n", find_highest_score(student_scores, NUM_OF_STUDENTS, &highest_score_index), student_scores[highest_score_index]);

    float average_score = calculate_average(student_scores, NUM_OF_STUDENTS);
    printf("Average score of all students is %.2f\n", average_score);

    printf("Scores in descending order:\n");
    sort_scores_descending(student_scores);
    for (int i = 0; i < NUM_OF_STUDENTS; i++) {
        printf("%d: %.2f\n", i+1, student_scores[i]);
    }

    return 0;
}

这个程序首先初始化一个浮点数组，然后分别找到最高分的学生、计算平均分并按降序排序。注意，由于浮点数比较可能存在精度问题，这里假设成绩范围是[0, 1)，并且在排序时直接进行了整数比较。