#include <iostream>

using namespace std;

class Segment {
	double A, B;
public:
	Segment(double A, double B) : A(A), B(B) { }

	friend ostream & operator<< (ostream &wyjscie, const Segment &s);

	friend const Segment operator*(const int
		&arg_lewy, const Segment &arg_prawy);

	friend const Segment operator+(const int
		&arg_lewy, const Segment &arg_prawy);

	friend const Segment operator*(const Segment
		&arg_lewy, const int &arg_prawy);

	friend const Segment operator/(const Segment
		&arg_lewy, const int &arg_prawy);

	friend const Segment operator+(const Segment
		&arg_lewy, const int &arg_prawy);

	friend const Segment operator+(const Segment
		&arg_lewy, const Segment &arg_prawy);

	friend const Segment operator-(const Segment
		&arg_lewy, const int &arg_prawy);

	const Segment operator-(Segment &s) {
		return Segment(A + s.A, B + s.B);
	};

	const bool operator()(double &d) {
		if (d == A || d == B)
			return true;
		else { false; }
	};

};

ostream & operator<< (ostream &wyjscie, const Segment &s) {
	return wyjscie << s.A << " " << s.B << endl;
}

const Segment operator*(const Segment & arg_lewy, const int & arg_prawy)
{
	return Segment(arg_lewy.A * arg_prawy,
		arg_lewy.B * arg_prawy);
}

const Segment operator*(const int & arg_lewy, const Segment & arg_prawy)
{
	return Segment(arg_lewy * arg_prawy.A,
		arg_lewy * arg_prawy.B);
}

const Segment operator+(const int & arg_lewy, const Segment & arg_prawy)
{
	return Segment(arg_lewy + arg_prawy.A,
		arg_lewy + arg_prawy.B);
}

const Segment operator/(const Segment & arg_lewy, const int & arg_prawy)
{
	return Segment(arg_lewy.A / arg_prawy,
		arg_lewy.B / arg_prawy);
}

const Segment operator+(const Segment & arg_lewy, const int & arg_prawy)
{
	return Segment(arg_lewy.A + arg_prawy,
		arg_lewy.B + arg_prawy);
}

const Segment operator+(const Segment & arg_lewy, const Segment & arg_prawy)
{
	return Segment(arg_lewy.A + arg_prawy.A,
		arg_lewy.B + arg_prawy.B);
}

const Segment operator-(const Segment & arg_lewy, const int & arg_prawy)
{
	return Segment(arg_lewy.A - arg_prawy,
		arg_lewy.B - arg_prawy);
}

int main() {
	using std::cout; using std::endl;
	Segment seg{ 2,3 }, s = 1 + 2 * ((seg - 2) / 2 + seg) / 3;
	cout << s << endl << std::boolalpha;
	for (double x = 0.5; x < 4; x += 1)
		cout << "x=" << x << ": " << s(x) << endl;
	return 0;
}