#include <iostream>
#include <math.h>
#include <fstream>
using namespace std;

class Vector {
	double x,y;

	char *fname;
  public:
    Vector(double,double);
    Vector();
	void print();
	double abs();
	Vector(char *);
	void save(char *);
	void add(Vector &);
};

Vector::Vector(double x, double y) {
	this->x = x;
	this->y = y;
}

Vector::Vector() {
	cin >> x >> y;
}

void Vector::print() {
	cout << "(" << x << "," << y << ")";
}

double Vector::abs() {
	return sqrt(x*x+y*y);
}
Vector::Vector(char *fname){
	ifstream i(fname);
	i>>x>>y;
	i.close();
}
void Vector::save(char *fname){
	ofstream o(fname);
	o<<x<<' '<<y;
	o.close();
}
void Vector::add(Vector &vek){
	x+=vek.x;
	y+=vek.y;
}
int main(int argc, char** argv) {
	Vector *v = new Vector();
	v->print();
	cout << v->abs();
	v->save("vector.txt");

	delete v;
	Vector *v2=new Vector("vector.txt");
	v2->print();
	Vector v3(4,5);
	v2->add(v3);
	v2->print();
	delete v2;
	//Vector v;
	//v.print();
	//cout << v.abs();
	return 0;
}