//Excerpts from date.C with three int data members, year, month, day.

//Move count days into the future.  If count is negative, move into the past.

void date::next(int count)
{
	div_t divide = div(count, 365);
	if (divide.rem < 0) {
		divide.rem += 365;
		--divide.quot;
	}

	year += divide.quot;
	day  += divide.rem;

	while (day > date_length[month]) {
		day -= date_length[month];
		if (++month > 12) {
			month = 1;
			++year;
		}
	}
}

//Return the Julian date.

int date::julian() const
{
	int j = day;

	for (int m = 1; m < month; ++m) {
		j += date_length[m];
	}

	return j;
}

//Header file for class date with one data member

#ifndef DATEH
#define DATEH

class date {
	int day;	//number of days before or after January 1, 0 AD
public:
	date(int initial_month, int initial_day, int initial_year);
	void next(int count = 1) {day += count;}
	int julian() const;
	void print() const;
};
#endif

//date.C file for class date with one data member

#include <iostream>
#include <cstdlib>   //for div, div_t, exit, EXIT_FAILURE
#include "date.h"
using namespace std;

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);
	}

	day = 365 * initial_year + initial_day - 1;

	for (int m = 1; m < initial_month; ++m) {
		day += date_length[m];
	}
}

int date::julian() const
{
	int j = day % 365;

	if (j < 0) {
		j += 365;
	}

	return j + 1;
}

void date::print() const
{
	div_t divide = div(day, 365);
	if (divide.rem < 0) {
		divide.rem += 365;
		--divide.quot;
	}

	int d = divide.rem + 1;
	int m;		//uninitialized variable

	for (m = 1; d > date_length[m]; ++m) {
		d -= date_length[m];
	}

	cout << m << "/" << d << "/" << divide.quot;
}