最近应老师的要求，和同学一起做了一个班级的管理系统，C++写的，直接上代码好吧

#include <iostream>
#include <string>
#include <vector>
#include <windows.h>

using namespace std;

struct Student {
    string name;
    string gender;
    string class_name;
    string grade;
    string id;
};

vector<Student> students;
int student_count = 0;

void display_menu() {
    cout << "1. 录入学生" << endl;
    cout << "2. 删除学生" << endl;
    cout << "3. 查看/录入成绩" << endl;
    cout << "4. 退出" << endl;
}

void enter_student() {
    string name, gender, class_name, grade, id;
    cout << "请输入学生姓名：";
    cin >> name;
    cout << "请输入学生性别：";
    cin >> gender;
    cout << "请输入学生班级：";
    cin >> class_name;
    cout << "请输入学生年级：";
    cin >> grade;
    cout << "请输入学生学号：";
    cin >> id;

    Student new_student = {name, gender, class_name, grade, id};
    students.push_back(new_student);
    student_count++;
    cout << "录入成功！当前学生人数：" << student_count << endl;
}

void delete_student() {
    string id;
    cout << "请输入要删除的学生学号：";
    cin >> id;

    for (size_t i = 0; i < students.size(); i++) {
        if (students[i].id == id) {
            cout << "确认删除吗？(Y/N): ";
            char confirm;
            cin >> confirm;
            if (confirm == 'Y' || confirm == 'y') {
                students.erase(students.begin() + i);
                student_count--;
                cout << "删除成功！" << endl;
                return;
            } else {
                cout << "取消删除。" << endl;
                return;
            }
        }
    }
    cout << "未找到该学生。" << endl;
}

void enter_scores() {
    string id;
    cout << "请输入学生学号：";
    cin >> id;

    for (const auto& student : students) {
        if (student.id == id) {
            cout << "请输入近5次的成绩：" << endl;
            for (int i = 0; i < 5; i++) {
                int score;
                cin >> score;
                // 保存成绩的逻辑，这里省略
            }
            cout << "成绩录入成功！" << endl;
            return;
        }
    }
    cout << "未找到该学生。" << endl;
}

int main() {
    string password;
    int attempts = 0;

    while (attempts < 3) {
        cout << "请输入密码：";
        cin >> password;

        if (password == "802329") {
            break;
        } else {
            attempts++;
            cout << "密码错误！剩余尝试次数：" << 3 - attempts << endl;
        }
    }

    if (attempts == 3) {
        cout << "密码错误次数过多，程序即将关闭。" << endl;
        system("shutdown /s /t 1");
        return 0;
    }

    HWND hwnd = GetConsoleWindow();
    HMENU hMenu = CreatePopupMenu();
    AppendMenu(hMenu, MF_STRING, 1, "录入学生");
    AppendMenu(hMenu, MF_STRING, 2, "删除学生");
    AppendMenu(hMenu, MF_STRING, 3, "查看/录入成绩");
    AppendMenu(hMenu, MF_STRING, 4, "退出");

    while (true) {
        display_menu();
        int choice;
        GetSystemMetrics(SM_CXSCREEN);
        GetSystemMetrics(SM_CYSCREEN);
        Sleep(100);
        SetForegroundWindow(hwnd);
        SetFocus(hwnd);
        ShowCaret(hwnd);
        SetCaretPos(100, 100);
        Sleep(100);
        SetFocus(hwnd);
        SetCursorPos(100, 100);
        SetCapture(hwnd);
        SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), ENABLE_WINDOW_INPUT | ENABLE_MOUSE_INPUT);
        MSG msg;
        while (GetMessage(&msg, NULL, 0, 0)) {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
            if (msg.message == WM_KEYDOWN) {
                switch (msg.wParam) {
                    case VK_ESCAPE:
                        DestroyMenu(hMenu);
                        PostQuitMessage(0);
                        break;
                    case VK_UP:
                    case VK_DOWN:
                    case VK_LEFT:
                    case VK_RIGHT:
                        ShowMenu(hMenu, choice);
                        break;
                    case VK_SPACE:
                        switch (choice) {
                            case 1:
                                enter_student();
                                break;
                            case 2:
                                delete_student();
                                break;
                            case 3:
                                enter_scores();
                                break;
                            case 4:
                                DestroyMenu(hMenu);
                                PostQuitMessage(0);
                                break;
                        }
                        break;
                    case VK_RETURN:
                        switch (choice) {
                            case 1:
                                enter_student();
                                break;
                            case 2:
                                delete_student();
                                break;
                            case 3:
                                enter_scores();
                                break;
                            case 4:
                                DestroyMenu(hMenu);
                                PostQuitMessage(0);
                                break;
                        }
                        break;
                }
            } else if (msg.message == WM_LBUTTONDOWN) {
                POINT pnt;
                GetCursorPos(&pnt);
                ScreenToClient(hwnd, &pnt);
                if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 100 && pnt.y <= 150) {
                    choice = 1;
                } else if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 150 && pnt.y <= 200) {
                    choice = 2;
                } else if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 200 && pnt.y <= 250) {
                    choice = 3;
                } else if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 250 && pnt.y <= 300) {
                    choice = 4;
                } else {
                    choice = -1;
                }
            } else if (msg.message == WM_RBUTTONDOWN) {
                POINT pnt;
                GetCursorPos(&pnt);
                ScreenToClient(hwnd, &pnt);
                if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 100 && pnt.y <= 150) {
                    choice = 1;
                } else if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 150 && pnt.y <= 200) {
                    choice = 2;
                } else if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 200 && pnt.y <= 250) {
                    choice = 3;
                } else if (pnt.x >= 100 && pnt.x <= 200 && pnt.y >= 250 && pnt.y <= 300) {
                    choice = 4;
                } else {
                    choice = -1;
                }
            } else if (msg.message == WM_DESTROY) {
                DestroyMenu(hMenu);
                PostQuitMessage(0);
                break;
            }
        }
    }
    return 0;
}

（1）打开程序后要先输入密码，密码为802329，如果输入错误超过3次就立刻关闭该程序并且关闭计算机。（2）程序输入正确后，在屏幕上创建 个按钮，用方向键选择，空格键进入。按钮在被点击后要进入相关功能的界面。（3）按钮一为录入学生，要收录学生的姓名，性别，班级，年级与学号，并且保存，还要在界面里显示录入学生人数。（4）按钮2为删除学生，当学生的姓名，性别，班级，年级与学号正确后，就可以按回车键删除，但是会弹出一个确认删除的按钮，按空格键同意后即删除该学生（5）按钮3名为 查看/录入成绩 ，先输入学生学号，让后录入或查看近5次的成绩。