帮我写一段C++代码，要求如下：某软件公司员工（Employee）可以分为现有两类人员：行政管理人员（Manager）和项目开发人员（Developer）。现在需要对公司的人员信息进行统一管理，存储人员的编号(number)、姓名(name)、职务级别(position)、每月固定奖金(monthBonus)、每月月收入(monthIncome)和计算每月月收入(void calculateMonthIncome())，并且能够显示员工全部信息(void showInfo())。 行政管理人员和项目开发人员均划分成三个等级，行政管理人员分为总经理(级别为1)、部门经理(级别为2)和小组长(级别为3)；行政管理人员月收入的计算公式为12000*（3-级别+1）/3+每月固定奖金，固定资金为3500元/月。 项目开发人员分为工作时间不满一年的(级别为3)、工作时间超过一年不到三年的(级别为2)和工龄在三年以上的(级别为1)；项目开发人员月收入的计算公式为6000*（3-级别+1）/3+奖金，奖金为其加班的小时数*40元/小时+每月固定奖金500元。 试编程实现上述人员管理，用虚函数实现体现出多态性。将Employee类的声明放在employee.h文件中、Employee类的实现放在employee.cpp文件中；将Manager类的声明放在manager.h文件中、Manager类的实现放在manager.cpp文件中；将Developer类的声明放在developer.h文件中、Developer类的实现放在developer.cpp文件中；主函数放在main.cpp文件中。

employee.h:

#ifndef EMPLOYEE_H
#define EMPLOYEE_H
#include <string>
using namespace std;

class Employee {
protected:
    int number;
    string name;
    int position;
    double monthBonus;
    double monthIncome;
public:
    Employee(int number, string name, int position, double monthBonus);
    virtual ~Employee();
    virtual void calculateMonthIncome() = 0;
    void showInfo();
};

#endif

employee.cpp:

#include "employee.h"
#include <iostream>
using namespace std;

Employee::Employee(int number, string name, int position, double monthBonus) {
    this->number = number;
    this->name = name;
    this->position = position;
    this->monthBonus = monthBonus;
    this->monthIncome = 0;
}

Employee::~Employee() {}

void Employee::showInfo() {
    cout << "编号：" << number << endl;
    cout << "姓名：" << name << endl;
    cout << "职务级别：" << position << endl;
    cout << "每月固定奖金：" << monthBonus << endl;
    cout << "每月月收入：" << monthIncome << endl;
}

manager.h:

#ifndef MANAGER_H
#define MANAGER_H
#include "employee.h"

class Manager : public Employee {
public:
    Manager(int number, string name, int position, double monthBonus);
    ~Manager();
    virtual void calculateMonthIncome();
};

#endif

manager.cpp:

#include "manager.h"

Manager::Manager(int number, string name, int position, double monthBonus) : Employee(number, name, position, monthBonus) {}

Manager::~Manager() {}

void Manager::calculateMonthIncome() {
    monthIncome = 12000 * (3 - position + 1) / 3 + monthBonus + 3500;
}

developer.h:

#ifndef DEVELOPER_H
#define DEVELOPER_H
#include "employee.h"

class Developer : public Employee {
private:
    int workHours;
public:
    Developer(int number, string name, int position, double monthBonus, int workHours);
    ~Developer();
    virtual void calculateMonthIncome();
};

#endif

developer.cpp:

#include "developer.h"

Developer::Developer(int number, string name, int position, double monthBonus, int workHours) : Employee(number, name, position, monthBonus) {
    this->workHours = workHours;
}

Developer::~Developer() {}

void Developer::calculateMonthIncome() {
    if (position == 1) {
        monthIncome = 6000 * (3 - position + 1) / 3 + monthBonus + workHours * 40 + 500;
    } else if (position == 2) {
        monthIncome = 6000 * (3 - position + 1) / 3 + monthBonus + workHours * 40;
    } else {
        monthIncome = 6000 * (3 - position + 1) / 3 + monthBonus;
    }
}

main.cpp:

#include "employee.h"
#include "manager.h"
#include "developer.h"
#include <iostream>
using namespace std;

int main() {
    Employee *e1 = new Manager(1001, "张三", 1, 5000);
    Employee *e2 = new Manager(1002, "李四", 2, 3000);
    Employee *e3 = new Developer(2001, "王五", 3, 2000, 80);
    Employee *e4 = new Developer(2002, "赵六", 1, 1000, 120);
    e1->calculateMonthIncome();
    e2->calculateMonthIncome();
    e3->calculateMonthIncome();
    e4->calculateMonthIncome();
    e1->showInfo();
    e2->showInfo();
    e3->showInfo();
    e4->showInfo();
    delete e1;
    delete e2;
    delete e3;
    delete e4;
    return 0;
}