入住管理模块代码：

```cpp
#include <QtWidgets>

// 客房类
class Room {
public:
    Room(int number) : m_number(number) {}
    int getNumber() const { return m_number; }
private:
    int m_number;
};

// 客房管理系统
class RoomManagementSystem : public QWidget {
    Q_OBJECT
public:
    RoomManagementSystem(QWidget *parent = nullptr) : QWidget(parent) {
        // 初始化客房列表
        m_rooms.append(new Room(101));
        m_rooms.append(new Room(102));
        m_rooms.append(new Room(103));
        m_rooms.append(new Room(104));

        // 创建UI元素
        QLabel *titleLabel = new QLabel("酒店客房管理系统");
        QLabel *roomLabel = new QLabel("客房号：");
        m_roomComboBox = new QComboBox;
        m_checkInButton = new QPushButton("入住");

        // 设置