帮我找出以下代码的问题：#include<iostream> #include<string> using namespace std; class MyData { private: int year; int month; int day; public: MyData(const int y, const int m, const int d) { this->year=y; this->month=m; this->day=d; } int getYear() { return year; } int getMonth() { return month; } int getDay() { return day; } }; class Person { private: string name; string address; string number; string email; public: Person(string n, string a, string num, string e) { name=n; address=a; number=num; email=e; } virtual string toString() const { return "Person:" + name; } }; class Student:public Person { private: string classStatus; public: Student(string n, string a, string num, string e, string c) :Person(n, a, num, e) { classStatus = c; } virtual string toString() const { return "Student:" + Person::toString(); } }; class Employee :public Person { private: string office; double salary; MyData dateHired; public: Employee(string n, string a, string num, string e, string o, double s, MyData d):Person(n, a, num, e) { office = o; salary = s; dateHired = d; } virtual string toString() const { return "Employee:" + Person::toString(); } }; class Faculty :public Employee { private: string officeHours; string rank; public: Faculty(string n, string a, string num, string e, string o, double s, MyData d, string oh, string r):Employee(n, a, num, o, s, d) { officeHours = oh; rank = r; } virtual string toString() const { return "Faculty" + Person::toString(); } }; class Staff :public Employee{ private: string title; public: Staff(string n, string a, string num, string e, string o, double s, MyData d, string t) :Employee(n, a, num, e, o, s, d) { title = t; } virtual string toString() const { return "Staff: " + Person::toString(); } }; int main() { MyData hireDate(2020, 1, 1); Person person("吴子木", "8#3021", "18162351558", "wzm18162351558@foxmail.com"); Student student(); Employee employee(); Faculty faculty(); Staff staff(); cout << person.toString() << endl; cout << student.toString() << endl; cout << employee.toString() << endl; cout << faculty.toString() << endl; cout << staff.toString() << endl; return 0; }

这段代码存在以下问题：

1. 在定义 Student、Employee、Faculty 和 Staff 对象时，应该调用它们的构造函数。但是代码中使用了空的括号，这将导致编译错误。

2. 在 Faculty 和 Staff 的 toString() 函数中，应该包含它们自己的信息，而不仅仅是调用它们的父类的 toString() 函数。

3. 在 Faculty 和 Staff 的构造函数中，调用 Employee 的构造函数应该传递正确的参数。

下面是修改后的代码：

#include<iostream> 
#include<string> 

using namespace std;

class MyData {
private:
    int year;
    int month;
    int day;

public:
    MyData(const int y, const int m, const int d) {
        this->year=y; this->month=m; this->day=d;
    }

    int getYear() {
        return year;
    }

    int getMonth() {
        return month;
    }

    int getDay() {
        return day;
    }
};

class Person {
private:
    string name;
    string address;
    string number;
    string email;

public:
    Person(string n, string a, string num, string e) {
        name=n; address=a; number=num; email=e;
    }

    virtual string toString() const {
        return "Person: " + name;
    }
};

class Student:public Person {
private:
    string classStatus;

public:
    Student(string n, string a, string num, string e, string c) :Person(n, a, num, e) {
        classStatus = c;
    }

    virtual string toString() const {
        return "Student: " + Person::toString();
    }
};

class Employee :public Person {
private:
    string office;
    double salary;
    MyData dateHired;

public:
    Employee(string n, string a, string num, string e, string o, double s, MyData d):Person(n, a, num, e) {
        office = o;
        salary = s;
        dateHired = d;
    }

    virtual string toString() const {
        return "Employee: " + Person::toString();
    }
};

class Faculty :public Employee {
private:
    string officeHours;
    string rank;

public:
    Faculty(string n, string a, string num, string e, string o, double s, MyData d, string oh, string r)
        :Employee(n, a, num, e, o, s, d) {
        officeHours = oh;
        rank = r;
    }

    virtual string toString() const {
        return "Faculty: " + Person::toString() + " " + officeHours + " " + rank;
    }
};

class Staff :public Employee{
private:
    string title;

public:
    Staff(string n, string a, string num, string e, string o, double s, MyData d, string t)
        :Employee(n, a, num, e, o, s, d) {
        title = t;
    }

    virtual string toString() const {
        return "Staff: " + Person::toString() + " " + title;
    }
};

int main() {
    MyData hireDate(2020, 1, 1);
    Person person("吴子木", "8#3021", "18162351558", "wzm18162351558@foxmail.com");
    Student student("张三", "8#3021", "18162351558", "zhangsan@example.com", "大学生");
    Employee employee("李四", "8#3021", "18162351558", "lisi@example.com", "教务处", 5000, hireDate);
    Faculty faculty("王五", "8#3021", "18162351558", "wangwu@example.com",
                    "图书馆", 8000, hireDate, "周一至周五，上午9点到下午5点", "副教授");
    Staff staff("赵六", "8#3021", "18162351558", "zhaoliu@example.com",
                "行政办公室", 3500, hireDate, "行政助理");

    cout << person.toString() << endl;
    cout << student.toString() << endl;
    cout << employee.toString() << endl;
    cout << faculty.toString() << endl;
    cout << staff.toString() << endl;

    return 0;
}