编写一个c++的代码（尽可能简单）可以实现以下要求，歌手比赛系统对一次歌手比赛的成绩进行管理，功能要求:1、依次输入每个选手的编号、姓名、十个评委的成绩，根据输入计算出总成绩和平均成绩(去掉最高分，去掉最低分)。2、显示主菜单如下:1)输入选手数据2)评委打分3)成绩排序(按平均分)4)数据查询5追加学生数据6退出系统)

以下是一个简单的 C 代码实现：

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

// 定义常量
#define MAX_STUDENTS 50
#define MAX_NAME_LEN 20
#define MAX_SCORES 10

// 定义结构体
struct student {
    int id;
    char name[MAX_NAME_LEN];
    float scores[MAX_SCORES];
    float total_score;
    float avg_score;
};

// 定义全局变量
struct student students[MAX_STUDENTS];
int num_students = 0;

// 函数声明
void input_student_data();
void input_scores();
void sort_scores();
void query_student_data();
void add_student_data();

int main() {
    int choice;
    do {
        printf("\n主菜单：\n");
        printf("1) 输入选手数据\n");
        printf("2) 评委打分\n");
        printf("3) 成绩排序(按平均分)\n");
        printf("4) 数据查询\n");
        printf("5) 追加学生数据\n");
        printf("6) 退出系统\n");
        printf("请选择操作：");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                input_student_data();
                break;
            case 2:
                input_scores();
                break;
            case 3:
                sort_scores();
                break;
            case 4:
                query_student_data();
                break;
            case 5:
                add_student_data();
                break;
            case 6:
                printf("谢谢使用！\n");
                break;
            default:
                printf("无效的选择！\n");
        }
    } while (choice != 6);

    return 0;
}

void input_student_data() {
    if (num_students >= MAX_STUDENTS) {
        printf("学生数量已达到上限！\n");
        return;
    }

    struct student s;
    printf("请输入学生编号：");
    scanf("%d", &s.id);
    printf("请输入学生姓名：");
    scanf("%s", s.name);
    students[num_students++] = s;
    printf("学生信息已添加！\n");
}

void input_scores() {
    if (num_students == 0) {
        printf("还没有录入学生信息！\n");
        return;
    }

    int id, index;
    printf("请输入学生编号：");
    scanf("%d", &id);
    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            index = i;
            break;
        }
        if (i == num_students - 1) {
            printf("找不到该学生，请重新输入编号！\n");
            return;
        }
    }

    float max_score = 0, min_score = 10;
    float sum = 0;
    for (int i = 0; i < MAX_SCORES; i++) {
        printf("请输入第 %d 位评委的成绩：", i + 1);
        scanf("%f", &students[index].scores[i]);
        if (students[index].scores[i] > max_score) {
            max_score = students[index].scores[i];
        }
        if (students[index].scores[i] < min_score) {
            min_score = students[index].scores[i];
        }
        sum += students[index].scores[i];
    }
    students[index].total_score = sum - max_score - min_score;
    students[index].avg_score = students[index].total_score / 8;
    printf("评分完成！\n");
}

void sort_scores() {
    if (num_students == 0) {
        printf("还没有录入学生信息！\n");
        return;
    }

    int i, j;
    struct student temp;
    for (i = 0; i < num_students - 1; i++) {
        for (j = i + 1; j < num_students; j++) {
            if (students[i].avg_score < students[j].avg_score) {
                temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }

    printf("成绩排序完成！\n");
    printf("序号\t姓名\t总分\t平均分\n");
    for (i = 0; i < num_students; i++) {
        printf("%d\t%s\t%.2f\t%.2f\n", students[i].id, students[i].name, students[i].total_score, students[i].avg_score);
    }
}

void query_student_data() {
    if (num_students == 0) {
        printf("还没有录入学生信息！\n");
        return;
    }

    int id, index;
    printf("请输入学生编号：");
    scanf("%d", &id);
    for (int i = 0; i < num_students; i++) {
        if (students[i].id == id) {
            index = i;
            break;
        }
        if (i == num_students - 1) {
            printf("找不到该学生，请重新输入编号！\n");
            return;
        }
    }

    printf("学生信息如下：\n");
    printf("编号：%d\n", students[index].id);
    printf("姓名：%s\n", students[index].name);
    printf("成绩：");
    for (int i = 0; i < MAX_SCORES; i++) {
        printf("%.1f ", students[index].scores[i]);
    }
    printf("\n总分：%.2f\n", students[index].total_score);
    printf("平均分：%.2f\n", students[index].avg_score);
}

void add_student_data() {
    if (num_students >= MAX_STUDENTS) {
        printf("学生数量已达到上限！\n");
        return;
    }

    struct student s;
    printf("请输入学生编号：");
    scanf("%d", &s.id);
    printf("请输入学生姓名：");
    scanf("%s", s.name);
    students[num_students++] = s;
    printf("学生信息已添加！\n");

    // 让用户选择是否继续录入成绩
    char choice;
    printf("是否要录入成绩？(y/n)");
    scanf(" %c", &choice);
    if (choice == 'y') {
        input_scores();
    }
}