求做一道C++题目，请大家帮忙

#include<string>
#include<iostream>
using namespace std;
class Date;
class Employee;

class Date
{
private:
    int year,month,day;
public:
    Date();
    Date(int,int,int);
    ~Date();
    friend class Employee;
};
///////////////////////////////////
Date::Date()
{
    cout<<"the year:";
    cin>>year;
    cout<<"the month:";
    cin>>month;
    cout<<"the day:";
    cin>>day;
}
Date::Date(int year_,int month_,int day_):year(year_),month(month_),day(day_)
{

}
Date::~Date(){};
///////////////////////////////////
class Employee
{
private:
    int no,birth_y,birth_m,birth_d;
    string name;
public:
    Employee(string,int,int,int,int);
    ~Employee();
    bool IsBirthday(Date);
};
///////////////////////////////////////
Employee::Employee(string name_,int no_,int birth_y_,int birth_m_,int birth_d_):\
name(name_),birth_y(birth_y_),birth_m(birth_m_),birth_d(birth_d_)
{

}
Employee::~Employee(){};
bool Employee::IsBirthday(Date today)
{
    if(today.month==birth_m&&today.day==birth_d)return true;
    else return false;
}
///////////////////////////////////////
int main()
{
    Employee Tom("Tom",1,1991,5,20);
    Date today(2015,5,22);
    if(Tom.IsBirthday(today))cout<<"happy birthday!\n";
    else cout<<"not the day today\n";
    return 0;
}