#include <iostream>
#include <string>


class CelsiusDeg {


public:

	double value;

	CelsiusDeg() {
		value = 0;
	}

	CelsiusDeg(double value) {
		this->value = value;
	}

	CelsiusDeg operator +(const CelsiusDeg & c) {
		return double(this->value + c.value);
	}

	CelsiusDeg operator -(const CelsiusDeg & c) {
		return double(this->value - c.value);
	}
};

class Kelvin {


public:

	double value;

	Kelvin() {
		value = -273;
	}

	Kelvin(double value) {
		this->value = value;
	}

	Kelvin operator +(const Kelvin & c) {
		return double(this->value + c.value);
	}

	Kelvin operator -(const Kelvin & c) {
		return double(this->value - c.value);
	}

};


std::ostream& operator << (std::ostream &stream, const CelsiusDeg &celsiusDeg) {
	return stream << celsiusDeg.value;
}

std::ostream& operator << (std::ostream &stream, const Kelvin &kelvin) {
	return stream << kelvin.value;
}

double operator + (const Kelvin &kelvin, const CelsiusDeg &celcius) {
	return double(kelvin.value + celcius.value);
}

double operator - (const Kelvin &kelvin, const CelsiusDeg &celcius) {
	return double(kelvin.value - celcius.value);
}


void coutEndl() {
	std::cout << std::endl;
}

int main() {
	uint8_t stop;

	CelsiusDeg celciusDeg1;
	CelsiusDeg celciusDeg2(20);
	Kelvin kelvin1;
	Kelvin kelvin2(10);
	std::string celciusScale = " [deg C] ";
	std::string kelvinScale = " [deg K] ";

	std::cout << celciusDeg1 << celciusScale << "+ " << celciusDeg2 << celciusScale << "= " << celciusDeg1 + celciusDeg2 << celciusScale << std::endl;
	std::cout << celciusDeg1 << celciusScale << "- " << celciusDeg2 << celciusScale << "= " << celciusDeg1 - celciusDeg2 << celciusScale << std::endl;

	coutEndl();

	std::cout << kelvin1 << kelvinScale << "+ " << kelvin2 << kelvinScale << "= " << kelvin1 + kelvin2 << kelvinScale << std::endl;
	std::cout << kelvin1 << kelvinScale << "- " << kelvin2 << kelvinScale << "= " << kelvin1 - kelvin2 << kelvinScale << std::endl;

	coutEndl();

	std::cout << kelvin1 << kelvinScale << "+ " << celciusDeg2 << celciusScale << "= " << kelvin1 + celciusDeg2 << std::endl;
	std::cout << kelvin1 << kelvinScale << "- " << celciusDeg2 << celciusScale << "= " << kelvin1 - celciusDeg2 << std::endl;

	coutEndl();

	std::cout << kelvin2 << kelvinScale << "+ " << celciusDeg1 << celciusScale << "= " << kelvin2 + celciusDeg1 << std::endl;
	std::cout << kelvin2 << kelvinScale << "- " << celciusDeg1 << celciusScale << "= " << kelvin2 - celciusDeg1 << std::endl;


	std::cin >> stop;
}