#include <iostream>

using namespace std;

class point
{
    double xyz[3];

public:
    point ()
    {
        this->xyz[0] = 0.0;
        this->xyz[1] = 0.0;
        this->xyz[2] = 0.0;
    }
    point (double *xyz)
    {
        this->xyz[0] = xyz[0];
        this->xyz[1] = xyz[1];
        this->xyz[2] = xyz[2];
    }
    point (double x,double y, double z)
    {
        this->xyz[0]=x;
        this->xyz[1]=y;
        this->xyz[2]=z;
    }
    friend ostream& operator<<(ostream& out,const point& p)
    {
        return out<<p.xyz[0]<<"\t"<<p.xyz[1]<<"\t"<<p.xyz[2]<<"\n";
    }
    const double& operator [] (int a)
    {
        return xyz[a];
    }

};

int main()
{
double x[2][3] = {{1.0, 1.0, 1.0},
 {1.0, 2.0, 3.0}};
 point p1(x[0]), p2(x[1]);
 const point p3(0.4, 0.2, 0.1);
 cout << p1 << ", " << p2 << '\n';
    cout << p3[0] << ' ' << p3[1] << ' ' << p3[2] << '\n';

    return 0;
}