#include<iostream>
using namespace std;

class point {
public:
	class point_iterator {
	public:
		int place;
		point *class_we_came_from;
		point_iterator(int p, point* cwcf) : place(p), class_we_came_from(cwcf) {}
		point_iterator& operator++() {
			place++;
			return *this;
		}
		bool operator!=(const point_iterator& other) const {
			return place != other.place;
		}
		float& operator*(){
			if(place == 0)
				return class_we_came_from->x;
			if(place == 1)
				return class_we_came_from->y;
			if(place == 2)
				return class_we_came_from->z;
			cout << "We have a problem\n";
			return class_we_came_from->x;
		}
	};
	float x, y, z;
	point(float ix, float iy, float iz) : x(ix), y(iy), z(iz) {}

	point operator+(point other){
		return point(x + other.x, y + other.y, z + other.z);
	}
	point_iterator begin() {
		return point_iterator(0, this);
	}

	point_iterator end() {
		return point_iterator(2, this);
	}
};

ostream& operator<<(ostream& out, const point& p){
	return out << "(" << p.x << ", " << p.y << "," << p.z << ")";
}

int main(){
	point a(3, 6, 1);
	point b(17, -2, 1);
	point c = a + b;
	cout << c << endl;
	for(auto &item : c)
		item *= 2;
	cout << c << endl;
	
}