#include <iostream>

class Point {
    double m_x;
    double m_y;
    double m_z;
    
public:
    Point()
        : m_x(0), m_y(0), m_z(0)
    { /** Default constructor */ }
    
    Point(const double a, const double b, const double c)
        : m_x(a), m_y(b), m_z(c)
    { /** ... */ }
    
    double x() const noexcept { return m_x; }
    double y() const noexcept { return m_y; }
    double z() const noexcept { return m_z; }
    
    friend std::ostream& operator<<(std::ostream& outputStream, const Point& p)
    {
        return outputStream << "(" << p.x() << "," << p.y() << "," << p.z() << ")";
    }
};

int main()
{
    Point origin { 0, 0, 0 };
    
    std::cout << "Origin: " << origin << '\n';
}