C++ Operator Overloading

#include <iostream>
using namespace std;

class Complex {
    double re, im;
public:
    Complex(double r = 0, double i = 0) : re(r), im(i) {}
    Complex operator+(const Complex &o) const { return Complex(re + o.re, im + o.im); }
    bool operator==(const Complex &o) const { return re == o.re && im == o.im; }
    friend ostream& operator<<(ostream &out, const Complex &c) {
        return out << c.re << " + " << c.im << "i";
    }
};

int main() {
    Complex a(2, 3), b(1, 4);
    Complex c = a + b;
    cout << c << endl;
    cout << (c == Complex(3, 7)) << endl;
}