#include <iostream>
using namespace std;

struct Point {
    int x, y;

    Point(int x = 0, int y = 0) : x(x), y(y)
    { }

    double r2() const { return x*x + y*y; }
};

struct Segment {
    Point A, B;

    Segment(Point A = Point(), Point B = Point())
        : A(A), B(B)
    { }

    const Point* operator->() const {
        return (A.r2() < B.r2()) ? &A : &B;
    }
};

ostream& operator<<(ostream& str, const Point& A) {
    return str << "P[" << A.x << "," << A.y << "]";
}

ostream& operator<<(ostream& str, const Segment& AB) {
    return str << AB.A << "--" << AB.B;
}

int main() {

    Point    A(1,0),  B(8,6),  C(4,3);
    Segment AB(A,B), BC(B,C), CA(C,A);

    cout << "AB = " << AB << ": AB->x = "
                    << AB->x << endl;

    cout << "BC = " << BC << ": BC->y = "
                    << BC->y << endl;

    cout << "CA = " << CA << ": CA->x = "
                    << CA->x << endl;
}