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

const int date_length[] = {
	 0,   //dummy element so that January will have subscript 1
	31,   //January
	28,   //February
	31,   //March
	30,   //April
	31,   //May
	30,   //June
	31,   //July
	31,   //August
	30,   //September
	31,   //October
	30,   //November
	31    //December
};

class date {
	int year;
	int month;               //1 to 12 inclusive
	int day;                 //1 to date_length[month] inclusive
public:
	date(int initial_month, int initial_day, int initial_year);
	void next(int count);    //Go count days forward.
	void next();             //Go one day forward.
	void print() const;      //Output date to cout (function declaration).
};                           //Don't forget ; at end of class declaration.

int main()
{
	//Construct d by passing three arguments to the constructor for d.
	//The constructor will initialize d's data members.

	date d(1, 1, 2014);      //parentheses around function arguments

	cout << "How many days forward from ";
	//cout << d.month << "/" << d.day << "/" << d.year;   //won't compile
	d.print();   //Pass the address of d to the print member function.
	cout << " do you want to go? ";

	int count;               //uninitialized variable
	cin >> count;

	d.next(count);
	cout << "The new date is ";
	d.print();
	cout << ".\n";

	return EXIT_SUCCESS;
}

date::date(int initial_month, int initial_day, int initial_year)
{
	if (initial_month < 1 || initial_month > 12) {
		cerr << "bad month " << initial_month << "/" << initial_day
			<< "/" << initial_year << "\n";
		exit(EXIT_FAILURE);
	}

	if (initial_day < 1 || initial_day > date_length[initial_month]) {
		cerr << "bad day " << initial_month << "/" << initial_day
			<< "/" << initial_year << "\n";
		exit(EXIT_FAILURE);
	}

	year = initial_year;
	month = initial_month;
	day = initial_day;
}

void date::next(int count)
{
	//Call the no-explicit-argument next (line 87) count times.
	//Pass along the implicit pointer we received.

	while (--count >= 0) {
		//call another member function of same object
		//(*this).next();
		//this->next();
		next();
	}
}

void date::next()
{
	//Move to the next date.
	if (++day > date_length[month]) {
		day = 1;
		if (++month > 12) {
			month = 1;
			++year;
		}
	}
}

void date::print() const   //This is a function definition.
{
	//cout << "The address of this object is " << this << ".\n";
	//cout << "Size in bytes of this object is " << sizeof *this << ".\n";

	//cout << (*this).month << "/" << (*this).day << "/" << (*this).year;
	//cout << this->month << "/" << this->day << "/" << this->year;
	cout << month << "/" << day << "/" << year;
}