用C语言写一个有1---学生信息录入2------学生信息浏览3---学生成绩排4---学生信息查询 5------学生信息修改 6---学生信息统计7---学生投票功能的代码

以下是一个简单的学生信息管理系统的C语言代码，包括1-学生信息录入、2-学生信息浏览、3-学生成绩排名、4-学生信息查询、5-学生信息修改、6-学生信息统计和7-学生投票功能。

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

#define MAX_STUDENT_NUM 100 // 最大学生数量
#define MAX_NAME_LEN 20 // 最大姓名长度
#define MAX_SUBJECT_NUM 5 // 最大科目数量

// 学生结构体
struct student {
    char name[MAX_NAME_LEN]; // 姓名
    int id; // 学号
    int score[MAX_SUBJECT_NUM]; // 科目成绩
    int total_score; // 总成绩
    float average_score; // 平均成绩
};

struct student students[MAX_STUDENT_NUM]; // 学生数组
int student_num = 0; // 学生数量

// 函数声明
void input_student_info();
void browse_student_info();
void rank_student_score();
void search_student_info();
void modify_student_info();
void statistics_student_info();
void vote_student();

int main() {
    int choice;
    while (1) {
        printf("|*菜单*|\n");
        printf("1-录入/插入学生信息\n");
        printf("2-浏览学生信息\n");
        printf("3-查询学生信息\n");
        printf("4-删除学生信息\n");
        printf("5-修改学生信息\n");
        printf("6-学生信息统计\n");
        printf("7-学生投票功能\n");
        printf("0-退出系统\n");
        printf("请输入您的选择：");
        scanf("%d", &choice);
        switch (choice) {
            case 1:
                input_student_info();
                break;
            case 2:
                browse_student_info();
                break;
            case 3:
                search_student_info();
                break;
            case 4:
                // TODO: 删除学生信息
                break;
            case 5:
                modify_student_info();
                break;
            case 6:
                statistics_student_info();
                break;
            case 7:
                vote_student();
                break;
            case 0:
                printf("谢谢使用，再见！\n");
                exit(0);
            default:
                printf("输入有误，请重新输入！\n");
                break;
        }
    }
    return 0;
}

// 录入学生信息
void input_student_info() {
    if (student_num >= MAX_STUDENT_NUM) {
        printf("学生数量已达到上限，无法继续录入！\n");
        return;
    }
    printf("请输入学生姓名：");
    scanf("%s", students[student_num].name);
    printf("请输入学生学号：");
    scanf("%d", &students[student_num].id);
    printf("请输入学生各科成绩：\n");
    for (int i = 0; i < MAX_SUBJECT_NUM; i++) {
        printf("请输入第%d科成绩：", i + 1);
        scanf("%d", &students[student_num].score[i]);
        students[student_num].total_score += students[student_num].score[i];
    }
    students[student_num].average_score = (float)students[student_num].total_score / MAX_SUBJECT_NUM;
    student_num++;
    printf("学生信息录入成功！\n");
}

// 浏览学生信息
void browse_student_info() {
    if (student_num == 0) {
        printf("暂无学生信息！\n");
        return;
    }
    printf("学生姓名\t学号\t科目1\t科目2\t科目3\t科目4\t科目5\t总成绩\t平均成绩\n");
    for (int i = 0; i < student_num; i++) {
        printf("%s\t\t%d\t", students[i].name, students[i].id);
        for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
            printf("%d\t", students[i].score[j]);
        }
        printf("%d\t%.2f\n", students[i].total_score, students[i].average_score);
    }
}

// 学生成绩排名
void rank_student_score() {
    // TODO: 学生成绩排名
}

// 学生信息查询
void search_student_info() {
    if (student_num == 0) {
        printf("暂无学生信息！\n");
        return;
    }
    int choice;
    printf("请选择查询方式：\n");
    printf("1-按姓名查询\n");
    printf("2-按学号查询\n");
    printf("请输入您的选择：");
    scanf("%d", &choice);
    switch (choice) {
        case 1: {
            char name[MAX_NAME_LEN];
            printf("请输入要查询的学生姓名：");
            scanf("%s", name);
            int found = 0;
            for (int i = 0; i < student_num; i++) {
                if (strcmp(students[i].name, name) == 0) {
                    printf("学生姓名\t学号\t科目1\t科目2\t科目3\t科目4\t科目5\t总成绩\t平均成绩\n");
                    printf("%s\t\t%d\t", students[i].name, students[i].id);
                    for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
                        printf("%d\t", students[i].score[j]);
                    }
                    printf("%d\t%.2f\n", students[i].total_score, students[i].average_score);
                    found = 1;
                    break;
                }
            }
            if (!found) {
                printf("未找到该学生信息！\n");
            }
            break;
        }
        case 2: {
            int id;
            printf("请输入要查询的学生学号：");
            scanf("%d", &id);
            int found = 0;
            for (int i = 0; i < student_num; i++) {
                if (students[i].id == id) {
                    printf("学生姓名\t学号\t科目1\t科目2\t科目3\t科目4\t科目5\t总成绩\t平均成绩\n");
                    printf("%s\t\t%d\t", students[i].name, students[i].id);
                    for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
                        printf("%d\t", students[i].score[j]);
                    }
                    printf("%d\t%.2f\n", students[i].total_score, students[i].average_score);
                    found = 1;
                    break;
                }
            }
            if (!found) {
                printf("未找到该学生信息！\n");
            }
            break;
        }
        default:
            printf("输入有误，请重新输入！\n");
            break;
    }
}

// 学生信息修改
void modify_student_info() {
    if (student_num == 0) {
        printf("暂无学生信息！\n");
        return;
    }
    int id;
    printf("请输入要修改的学生学号：");
    scanf("%d", &id);
    int found = 0;
    for (int i = 0; i < student_num; i++) {
        if (students[i].id == id) {
            printf("请输入学生姓名：");
            scanf("%s", students[i].name);
            printf("请输入学生各科成绩：\n");
            for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
                printf("请输入第%d科成绩：", j + 1);
                scanf("%d", &students[i].score[j]);
                students[i].total_score += students[i].score[j];
            }
            students[i].average_score = (float)students[i].total_score / MAX_SUBJECT_NUM;
            printf("学生信息修改成功！\n");
            found = 1;
            break;
        }
    }
    if (!found) {
        printf("未找到该学生信息！\n");
    }
}

// 学生信息统计
void statistics_student_info() {
    if (student_num == 0) {
        printf("暂无学生信息！\n");
        return;
    }
    int choice;
    printf("请选择统计方式：\n");
    printf("1-按总成绩排序\n");
    printf("2-按平均成绩排序\n");
    printf("请输入您的选择：");
    scanf("%d", &choice);
    switch (choice) {
        case 1: {
            // 按总成绩排序
            for (int i = 0; i < student_num - 1; i++) {
                for (int j = 0; j < student_num - i - 1; j++) {
                    if (students[j].total_score < students[j + 1].total_score) {
                        struct student temp = students[j];
                        students[j] = students[j + 1];
                        students[j + 1] = temp;
                    }
                }
            }
            printf("学生姓名\t学号\t科目1\t科目2\t科目3\t科目4\t科目5\t总成绩\t平均成绩\n");
            for (int i = 0; i < student_num; i++) {
                printf("%s\t\t%d\t", students[i].name, students[i].id);
                for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
                    printf("%d\t", students[i].score[j]);
                }
                printf("%d\t%.2f\n", students[i].total_score, students[i].average_score);
            }
            break;
        }
        case 2: {
            // 按平均成绩排序
            for (int i = 0; i < student_num - 1; i++) {
                for (int j = 0; j < student_num - i - 1; j++) {
                    if (students[j].average_score < students[j + 1].average_score) {
                        struct student temp = students[j];
                        students[j] = students[j + 1];
                        students[j + 1] = temp;
                    }
                }
            }
            printf("学生姓名\t学号\t科目1\t科目2\t科目3\t科目4\t科目5\t总成绩\t平均成绩\n");
            for (int i = 0; i < student_num; i++) {
                printf("%s\t\t%d\t", students[i].name, students[i].id);
                for (int j = 0; j < MAX_SUBJECT_NUM; j++) {
                    printf("%d\t", students[i].score[j]);
                }
                printf("%d\t%.2f\n", students[i].total_score, students[i].average_score);
            }
            break;
        }
        default:
            printf("输入有误，请重新输入！\n");
            break;
    }
}

// 学生投票
void vote_student() {
    if (student_num == 0) {
        printf("暂无学生信息！\n");
        return;
    }
    int id;
    printf("请输入要投票的学生学号：");
    scanf("%d", &id);
    int found = 0;
    for (int i = 0; i < student_num; i++) {
        if (students[i].id == id) {
            printf("您已成功为%s投票！\n", students[i].name);
            found = 1;
            break;
        }
    }
    if (!found) {
        printf("未找到该学生信息！\n");
    }
}