帮我使用C++写一份公司管理系统，需要复杂一点，再加上注释

好的，我可以帮你写一份公司管理系统。由于公司管理系统的功能比较复杂，我会尽可能地详细解释每个部分的实现方式和注释。下面是一份基于C++的公司管理系统：

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

// Employee类表示公司员工
class Employee {
public:
    Employee(string name, int age, string position, int salary) {
        this->name = name;
        this->age = age;
        this->position = position;
        this->salary = salary;
    }

    string getName() const { return name; }
    int getAge() const { return age; }
    string getPosition() const { return position; }
    int getSalary() const { return salary; }

    void setName(string name) { this->name = name; }
    void setAge(int age) { this->age = age; }
    void setPosition(string position) { this->position = position; }
    void setSalary(int salary) { this->salary = salary; }

    // 显示员工信息
    void displayEmployee() const {
        cout << "Name: " << name << endl;
        cout << "Age: " << age << endl;
        cout << "Position: " << position << endl;
        cout << "Salary: " << salary << endl;
    }

private:
    string name;
    int age;
    string position;
    int salary;
};

// Company类表示公司
class Company {
public:
    // 添加员工
    void addEmployee() {
        string name, position;
        int age, salary;

        cout << "Enter employee name: ";
        cin >> name;
        cout << "Enter employee age: ";
        cin >> age;
        cout << "Enter employee position: ";
        cin >> position;
        cout << "Enter employee salary: ";
        cin >> salary;

        Employee employee(name, age, position, salary);
        employees.push_back(employee);
        cout << "Employee added successfully!" << endl;
    }

    // 显示所有员工信息
    void displayAllEmployees() const {
        for (const auto& employee : employees) {
            employee.displayEmployee();
            cout << endl;
        }
    }

    // 显示员工薪资排名
    void displaySalaryRanking() const {
        vector<Employee> tempEmployees = employees;
        sort(tempEmployees.begin(), tempEmployees.end(), [](const Employee& employee1, const Employee& employee2) {
            return employee1.getSalary() > employee2.getSalary();
        });
        cout << "Salary Ranking:" << endl;
        int rank = 1;
        for (const auto& employee : tempEmployees) {
            cout << rank << ". " << employee.getName() << " (" << employee.getSalary() << ")" << endl;
            rank++;
        }
    }

    // 更新员工信息
    void updateEmployeeInfo() {
        string name;
        cout << "Enter employee name: ";
        cin >> name;

        bool found = false;
        for (auto& employee : employees) {
            if (employee.getName() == name) {
                found = true;
                string position;
                int age, salary;

                cout << "Enter new position: ";
                cin >> position;
                cout << "Enter new age: ";
                cin >> age;
                cout << "Enter new salary: ";
                cin >> salary;

                employee.setPosition(position);
                employee.setAge(age);
                employee.setSalary(salary);
                cout << "Employee information updated successfully!" << endl;
                break;
            }
        }

        if (!found) {
            cout << "Employee not found!" << endl;
        }
    }

    // 删除员工
    void deleteEmployee() {
        string name;
        cout << "Enter employee name: ";
        cin >> name;

        bool found = false;
        for (auto it = employees.begin(); it != employees.end(); ++it) {
            if (it->getName() == name) {
                found = true;
                employees.erase(it);
                cout << "Employee deleted successfully!" << endl;
                break;
            }
        }

        if (!found) {
            cout << "Employee not found!" << endl;
        }
    }

private:
    vector<Employee> employees;
};

// 主函数
int main() {
    Company company;
    int choice;

    while (true) {
        cout << "1. Add employee" << endl;
        cout << "2. Display all employees" << endl;
        cout << "3. Display salary ranking" << endl;
        cout << "4. Update employee information" << endl;
        cout << "5. Delete employee" << endl;
        cout << "6. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {
            case 1:
                company.addEmployee();
                break;
            case 2:
                company.displayAllEmployees();
                break;
            case 3:
                company.displaySalaryRanking();
                break;
            case 4:
                company.updateEmployeeInfo();
                break;
            case 5:
                company.deleteEmployee();
                break;
            case 6:
                cout << "Goodbye!" << endl;
                return 0;
            default:
                cout << "Invalid choice!" << endl;
                break;
        }
    }

    return 0;
}

在上面的代码中，我们定义了一个`Employee`类来表示公司员工，每个员工有名字、年龄、职位和薪水四个属性。`Company`类表示整个公司，其中包含了添加员工、显示所有员工信息、显示员工薪资排名、更新员工信息和删除员工等五个功能。

在主函数中，我们使用一个循环来实现菜单选择功能。用户可以通过输入不同的数字来选择不同的功能，然后调用相应的`Company`类的函数来实现相应的功能。

注释已经添加到代码中，希望对你有所帮助！