#include <iostream>
#include <cmath>   //for the exp and pow functions
#include "derived_weather.h"
using namespace std;

derived_weather::derived_weather(double h, double w, double t)
	: base_weather {h, w}, temperature {t}
{
}

double derived_weather::relative_humidity() const
{
	const double saturation_humidity
		{216.7 * exp(17.67 * temperature / (temperature + 243.5))};

	return 100 * a() / saturation_humidity;
}

double derived_weather::wind_chill() const
{
	const double x {pow(v(), 0.16)};

	return 13.12 + 0.6215 * temperature - 11.37 * x
		+ 0.3965 * temperature * x;
}

void derived_weather::print() const
{
	cout << "temperature = " << temperature << " Celsius\n"
		"relative humidity = " << relative_humidity() << "%\n"
		"wind chill = " << wind_chill() << " Celsius\n";

	base_weather::print();   //Do the rest of the job.
}