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

class DayOfYear
{
private:
    int month;
    int day;
    void testDate();
public:
    DayOfYear(int monthValue, int dayValue);
    DayOfYear(int monthValue);
    DayOfYear();

    void input();
    void output();
    int getMonthNumber();
    int getDay();
};

DayOfYear::DayOfYear(int monthValue, int dayValue) 
            : month(monthValue), day(dayValue)
{
    testDate();
}

DayOfYear::DayOfYear(int monthValue) 
            : month(monthValue), day(1)
{
    testDate();
}

DayOfYear::DayOfYear() 
            : month(1), day(1)
{}

void DayOfYear::testDate()
{
    //
    if((month < 1) || (month > 12))
    {
        //
        cout << "Invalid month.\n";
    }
    if((day < 1) || (day > 31))
    {
        //
        cout << "Invalid day.\n";
    }
}

void DayOfYear::output()
{
    string Months [] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
    cout << "The month is " << Months[month-1] << " and the day is " << day;
}

int main()
{
    DayOfYear date1(2, 21), date2(5), date3;
    cout << "Initialized dates:" << endl;
    date1.output(); cout << endl;
    date2.output(); cout << endl;
    date3.output(); cout << endl;

    date1 = DayOfYear(10, 31);
    cout << "Date 1 reset to the following: " << endl;
    date1.output(); cout << endl;
    return 0;
}