/************************************
*Purpose:  Generate a non-graphical biorhythm.
*************************************/

#include <iostream>
#include <cmath>
#include <cassert>

#define PHYS 23	//days in the physical cycle
#define EMOT 28	//days in the emotional cycle
#define MENTAL 33	//days in the mental cycle

using namespace std;

//Input conversion functions
double gregToJul(double birth_month, double birth_date, double birth_year);
double gregToJul(double check_month, double check_date, double check_year);

//Output and calculation function
void biorhythm(double days_lived, int& phys, int& iq, int& emotion);

int main()
{
	int phys, iq, emotion;
	char y, n;
	
	cout << "Enter your the month (number) you were born: ";
	int birth_month;
	cin >> birth_month;
	
	cout << "\nEnter the day you were born: ";
	int birth_day;
	cin >> birth_day;
	
	cout << "\nEnter the year you were born: ";
	int birth_year;
	cin >> birth_year;
	
	//this function call converts the "normal" birthday into the Julian date
	double jul_birth_date=gregToJul(birth_month, birth_day, birth_year);
	
	//loop for selecting the date user interested in
	do{
		cout << "\nEnter the month (number) you want to check: ";
		int check_month;
		cin >> check_month;
	
		cout << "\nEnter the day you want to check: ";
		int check_day;
		cin >> check_day;
	
		cout << "\nEnter the year you want to check: ";
		int check_year;
		cin >> check_year;
		
		//this function call converts the user's day of choice into Julian
		double jul_check_date=gregToJul(check_month, check_day, check_year);
		
		//determine how many days lived
		double days_lived=jul_check_date-jul_birth_date;
		
		biorhythm(days_lived, phys, iq, emotion);
		
		cout << "\nDo you want to check another date? y or n: ";
		char recheck;
		cin >> recheck;
	while (recheck==y);
	
	cout << "\nYour current physical index is: " << phys
		<< "\nYour current intellectual index is: " << iq
		<< "\nYour current emotional index is: " << emotion
		<< "\nYour biorhythm index is: " << phys+iq+emotion;
}

/**********************************************
*gregToJul() converts the Gregorian birth date into Julian version.
*
*Receive:	month, an (integer) number
*			day, an (integer) number
*			year, an (integer) number
*Precondition: the date is valid
*Return: 	JD, a (real) number
************************************************/

double gregToJul(double M, double D, double Y)
{
	assert (1<=M<=12);
	assert (1<=D<=31);
	assert (1801<=Y<=2009);
	
	//this formula is modified from the US Naval Observatory function;
	//the GMT conversion factor has been removed for clarity
	double JD = 367*Y-(7*(Y+(M+9)/12))/4 + (275*M)/9 + D + 1721013.5;
	return JD;
}

/**************************************************
*biorhythm() takes a person's age and returns the physical, 
*intellectual, and emotional cycle indexes.
*
*Receive: 	days_lived, a (real) value
*Send back: phys, an (integer) value
*			iq, an (integer) value
*			emotion, an (integer) value
************************************************/

void biorhythm(double days, int& phys, int& iq, int& emotion)
{
	phys=days/PHYS;
	iq=days/MENTAL;
	emotion=days/EMOT;
}

do {
}while