#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);

    const Segment operator*(int &d) {
        return Segment(A*d, B*d);
    };

    const Segment operator/(int &d) {
        return Segment(A/d, B/d);
    };

    const Segment operator+(int &d) {
        return Segment(A + d, B + d);
    };

    const Segment operator-(int &d) {
        return Segment(A-d, B-d);
    };

    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 << endl << "Srednia ocen: " << s.B << endl;
}

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;
}