实现公司员工的管理，设计employee类，包含员工基本信息：编号，姓名，性命，出生日期和职务等。出生日期使用自定义的date类，employee类有可能从外部访问类成员的友元函数，程序基本功能有：1职工信息的录入，2职工信息的显示3.用对象数组保存已输入的职工对象4.可以修改人员的基本信息5.可以通过编号或姓名进行人员查询2.

好的，我可以为您提供一个简单的employee类的实现，包含员工基本信息的编号、姓名、性别、出生日期和职务，以及相应的成员函数和友元函数。

#include <iostream>
#include <string>

using namespace std;

class Date {
private:
    int year, month, day;
public:
    Date(int y = 0, int m = 0, int d = 0) : year(y), month(m), day(d) {}
    friend ostream& operator<<(ostream& os, const Date& date);
};

ostream& operator<<(ostream& os, const Date& date) {
    os << date.year << "-" << date.month << "-" << date.day;
    return os;
}

class Employee {
private:
    int id;
    string name;
    char gender;
    Date birthday;
    string position;
public:
    Employee(int i = 0, const string& n = "", char g = 'M', const Date& b = Date(), const string& p = "") :
        id(i), name(n), gender(g), birthday(b), position(p) {}
    friend ostream& operator<<(ostream& os, const Employee& employee);
    friend istream& operator>>(istream& is, Employee& employee);
    void modify();
    bool match(const string& keyword) const;
};

ostream& operator<<(ostream& os, const Employee& employee) {
    os << employee.id << "\t" << employee.name << "\t" << employee.gender << "\t" << employee.birthday << "\t" << employee.position;
    return os;
}

istream& operator>>(istream& is, Employee& employee) {
    is >> employee.id >> employee.name >> employee.gender >> employee.birthday.year >> employee.birthday.month >> employee.birthday.day >> employee.position;
    return is;
}

void Employee::modify() {
    cout << "Please input the new information: " << endl;
    cout << "Name: ";
    cin >> name;
    cout << "Gender (M/F): ";
    cin >> gender;
    cout << "Birthday (yyyy-mm-dd): ";
    cin >> birthday;
    cout << "Position: ";
    cin >> position;
}

bool Employee::match(const string& keyword) const {
    return name.find(keyword) != string::npos || position.find(keyword) != string::npos;
}

int main() {
    const int MAX_EMPLOYEES = 100;
    Employee employees[MAX_EMPLOYEES];
    int count = 0;

    while (true) {
        cout << "Please choose an operation:" << endl;
        cout << "1. Add an employee" << endl;
        cout << "2. Display all employees" << endl;
        cout << "3. Modify an employee's information" << endl;
        cout << "4. Search employees by name or position" << endl;
        cout << "0. Exit" << endl;
        int choice;
        cin >> choice;

        switch (choice) {
        case 0:
            cout << "Goodbye!" << endl;
            return 0;
        case 1:
            if (count == MAX_EMPLOYEES) {
                cout << "The maximum number of employees has been reached." << endl;
            } else {
                cout << "Please input the information of the new employee: " << endl;
                cin >> employees[count];
                count++;
            }
            break;
        case 2:
            if (count == 0) {
                cout << "No employee information found." << endl;
            } else {
                cout << "ID\tName\tGender\tBirthday\tPosition" << endl;
                for (int i = 0; i < count; i++) {
                    cout << employees[i] << endl;
                }
            }
            break;
        case 3:
            if (count == 0) {
                cout << "No employee information found." << endl;
            } else {
                cout << "Please input the ID of the employee to modify: ";
                int id;
                cin >> id;
                bool found = false;
                for (int i = 0; i < count; i++) {
                    if (employees[i].id == id) {
                        employees[i].modify();
                        found = true;
                        break;
                    }
                }
                if (!found) {
                    cout << "No employee with ID " << id << " found." << endl;
                }
            }
            break;
        case 4:
            if (count == 0) {
                cout << "No employee information found." << endl;
            } else {
                cout << "Please input the keyword to search: ";
                string keyword;
                cin >> keyword;
                bool found = false;
                cout << "ID\tName\tGender\tBirthday\tPosition" << endl;
                for (int i = 0; i < count; i++) {
                    if (employees[i].match(keyword)) {
                        cout << employees[i] << endl;
                        found = true;
                    }
                }
                if (!found) {
                    cout << "No employee matching \"" << keyword << "\" found." << endl;
                }
            }
            break;
        default:
            cout << "Invalid choice." << endl;
            break;
        }
    }

    return 0;
}

以上是一个简单的员工管理程序，可以实现基本的员工信息的录入、显示、修改和查询。您可以根据需要进行修改和扩展。