#include <iostream>
using namespace std;
class Vector {
    friend ostream& operator<< (ostream&, Vector&);
    friend bool operator ==(Vector &, Vector &);
    friend Vector operator+(Vector &, Vector &);
private:
    float i, j, k;
public:
    Vector() : i(0), j(0), k(0) {}
    Vector(float x, float y, float z) : i(x), j(y), k(z) {}
    Vector& operator= (Vector &);
};

Vector operator+(Vector &V1, Vector &V2) {
    return Vector(V1.i + V2.i, V1.j + V2.j, V1.k + V2.k);
}

bool operator ==(Vector &V1, Vector &V2) {
    return V1.i == V2.i && V1.j == V2.j && V1.k == V2.k;
}

ostream& operator<< (ostream& Exit, Vector &Vec) {
    Exit << Vec.i << "i + " << Vec.j << "j + " << Vec.k << "k" << endl;
    return Exit;
}

Vector& Vector:: operator= (Vector &Vec) {
    i = Vec.i;
    j = Vec.j;
    k = Vec.k;
    return *this;
}

int main(void) {
    Vector V1(1,1,1), V2(1, 2, 3);
    Vector V3 = V1 + V2;
    Vector V4;
    cout << V3 << endl;
    cout << (V1 == V2) << endl;
    V4 = V2;
    cout << V4 << endl;
    return 0;
}