#include <iostream>
#include <string>
using namespace std;

struct Date{
    int day;
    int month;
    int year;
};

class Student{
public:
    Student(int _id, string _fullname, Date _birthday, string _yclass);

    int getId() const;
    string getFullname() const;
    Date getBirthday() const;
    string getClass() const;

    void setId(int _id);
    void setFullname(string _fullname);
    void setBirthday(Date _birthday);
    void setClass(string _yclass);

    friend bool operator<(const Student& student1, const Student& student2);
    friend bool operator==(const Student& student1, const Student& student2);
    friend istream& operator>>(istream& is, Student& someStudent);
    friend ostream& operator<<(ostream& os, Student& someStudent);

private:
    int id;			// ma sinh vien
    string fullname;// ho ten
    Date birthday;	// ngay sinh
    string yclass;	// lop khoa hoc
};

Student::Student(int _id, string _fullname, Date _birthday, string _yclass)
    :id(_id), fullname(_fullname), birthday(_birthday), yclass(_yclass)
{}

inline int Student::getId() const{
    return id;
}

inline string Student::getFullname() const{
    return fullname;
}

inline Date Student::getBirthday() const{
    return birthday;
}

inline string Student::getClass() const{
    return yclass;
}

void Student::setId(int _id){
    id = _id;
}

void Student::setFullname(string _fullname){
    fullname = _fullname;
}

void Student::setBirthday(Date _birthday){
    birthday = _birthday;
}

void Student::setClass(string _yclass){
    yclass = _yclass;
}


int main(){
    return 0;
}