用c++写一个带密码和职位的员工工资管理系统

好的，下面是一个简单的员工工资管理系统的代码示例：

#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;

// 定义Employee类
class Employee {
private:
    string name;
    string password;
    string position;
    double salary;

public:
    Employee(string n, string p, string pos, double s) {
        name = n;
        password = p;
        position = pos;
        salary = s;
    }

    string getName() const {
        return name;
    }

    string getPassword() const {
        return password;
    }

    string getPosition() const {
        return position;
    }

    double getSalary() const {
        return salary;
    }

    void setPassword(string p) {
        password = p;
    }

    void setPosition(string pos) {
        position = pos;
    }

    void setSalary(double s) {
        salary = s;
    }

    // 重载运算符，用于比较Employee对象的大小
    bool operator<(const Employee& e) const {
        return name < e.getName();
    }

    // 友元函数，用于在屏幕上输出Employee对象的信息
    friend ostream& operator<<(ostream& os, const Employee& e);
};

// 在屏幕上输出Employee对象的信息
ostream& operator<<(ostream& os, const Employee& e) {
    os << "Name: " << e.name << ", Position: " << e.position << ", Salary: " << e.salary;
    return os;
}

// 读取员工信息文件
vector<Employee> readEmployees(string filename) {
    vector<Employee> employees;
    ifstream infile(filename);
    if (!infile.is_open()) {
        cerr << "Failed to open file: " << filename << endl;
        return employees;
    }

    string name, password, position;
    double salary;
    while (infile >> name >> password >> position >> salary) {
        Employee e(name, password, position, salary);
        employees.push_back(e);
    }

    infile.close();
    return employees;
}

// 写入员工信息文件
void writeEmployees(string filename, const vector<Employee>& employees) {
    ofstream outfile(filename);
    if (!outfile.is_open()) {
        cerr << "Failed to open file: " << filename << endl;
        return;
    }

    for (const Employee& e : employees) {
        outfile << e.getName() << " " << e.getPassword() << " " << e.getPosition() << " " << e.getSalary() << endl;
    }

    outfile.close();
}

// 添加员工信息
void addEmployee(vector<Employee>& employees) {
    string name, password, position;
    double salary;
    cout << "Enter name: ";
    cin >> name;
    cout << "Enter password: ";
    cin >> password;
    cout << "Enter position: ";
    cin >> position;
    cout << "Enter salary: ";
    cin >> salary;
    Employee e(name, password, position, salary);
    employees.push_back(e);
    cout << "Employee added successfully." << endl;
}

// 删除员工信息
void deleteEmployee(vector<Employee>& employees) {
    string name;
    cout << "Enter name of employee to delete: ";
    cin >> name;
    for (auto it = employees.begin(); it != employees.end(); ++it) {
        if (it->getName() == name) {
            employees.erase(it);
            cout << "Employee deleted successfully." << endl;
            return;
        }
    }
    cout << "Employee not found." << endl;
}

// 修改员工信息
void modifyEmployee(vector<Employee>& employees) {
    string name;
    cout << "Enter name of employee to modify: ";
    cin >> name;
    for (auto& e : employees) {
        if (e.getName() == name) {
            string password, position;
            double salary;
            cout << "Enter new password: ";
            cin >> password;
            cout << "Enter new position: ";
            cin >> position;
            cout << "Enter new salary: ";
            cin >> salary;
            e.setPassword(password);
            e.setPosition(position);
            e.setSalary(salary);
            cout << "Employee modified successfully." << endl;
            return;
        }
    }
    cout << "Employee not found." << endl;
}

// 查找员工信息
void findEmployee(const vector<Employee>& employees) {
    string name;
    cout << "Enter name of employee to find: ";
    cin >> name;
    for (const auto& e : employees) {
        if (e.getName() == name) {
            cout << e << endl;
            return;
        }
    }
    cout << "Employee not found." << endl;
}

// 显示所有员工信息
void displayEmployees(const vector<Employee>& employees) {
    for (const auto& e : employees) {
        cout << e << endl;
    }
}

// 根据员工名字排序并显示
void sortEmployees(vector<Employee>& employees) {
    sort(employees.begin(), employees.end());
    displayEmployees(employees);
}

int main() {
    string password;
    cout << "Enter password to access the system: ";
    cin >> password;
    if (password != "password") {
        cout << "Access denied." << endl;
        return 0;
    }

    vector<Employee> employees = readEmployees("employees.txt");
    if (employees.empty()) {
        cout << "No employee data found." << endl;
        return 0;
    }

    int choice;
    do {
        cout << endl;
        cout << "1. Add employee" << endl;
        cout << "2. Delete employee" << endl;
        cout << "3. Modify employee" << endl;
        cout << "4. Find employee" << endl;
        cout << "5. Display all employees" << endl;
        cout << "6. Sort employees by name" << endl;
        cout << "0. Exit" << endl;
        cout << "Enter your choice: ";
        cin >> choice;

        switch (choice) {
            case 1:
                addEmployee(employees);
                writeEmployees("employees.txt", employees);
                break;
            case 2:
                deleteEmployee(employees);
                writeEmployees("employees.txt", employees);
                break;
            case 3:
                modifyEmployee(employees);
                writeEmployees("employees.txt", employees);
                break;
            case 4:
                findEmployee(employees);
                break;
            case 5:
                displayEmployees(employees);
                break;
            case 6:
                sortEmployees(employees);
                break;
            case 0:
                writeEmployees("employees.txt", employees);
                break;
            default:
                cout << "Invalid choice." << endl;
                break;
        }
    } while (choice != 0);

    return 0;
}

这个代码示例实现了以下功能：

1. 在程序运行前，需要输入密码才能进入系统。
2. 程序从文件 "employees.txt" 中读取员工信息，然后将它们存储在一个 vector<Employee> 对象中。
3. 程序提供了以下选项：
1. 添加员工信息。
2. 删除员工信息。
3. 修改员工信息。
4. 查找员工信息。
5. 显示所有员工信息。
6. 根据员工名字排序并显示。
7. 退出程序。
4. 每次进行修改、删除、添加员工信息操作后，程序都将更新员工信息文件 "employees.txt"。

请注意，这个代码示例仅仅是一个简单的员工工资管理系统，它还有很多可以改进的地方。比如，它没有对用户输入进行错误处理，也没有对文件读写操作进行异常处理。在实际应用中，这些问题都需要得到仔细处理。同时，还需要考虑如何保护敏感信息（比如密码）的安全性。