Adding 2 vectors

[CodeOpen]

Why is the result wrong?
1.79302e-307,1.79317e-307+-8.94132e+070,2.60732e+253=7.23027e-308,7.23127e-308

Correct result should be :(1.5, 8.0)

  #include <iostream>
#include <fstream>
using namespace std;

class Vector2D {
private:
    double x, y;
public:

    Vector2D (double x, double y) {
    }
    friend Vector2D operator +(Vector2D a, Vector2D b){
        return Vector2D(a.x*b.x, a.y*b.y);
    }
    friend ostream& operator << (ostream& s , Vector2D v){
        return s << v.x << "," << v.y ;
    }
};


int main() {
    Vector2D a(2.5, 2.0);
    Vector2D b(-1, 6);

    Vector2D c = a + b;   // (1.5, 8.0)
    cout << a  << "+"  << b << "=" << c <<'\n';
}

[Danny Toledo]

You need to initialize the member variables x and y (you have the constructor, but you don't have anything in it). Also, should you be adding a.x and b.x, and a.y and b.y instead of multiplying them?