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

#include "complex.h"

complex operator+(complex a, complex b) {
  return complex(a.real() + b.real(), a.imag() + b.imag());
}

ostream & operator <<(ostream & os, complex c) {
  os << '(' << c.real() << ", " << c.imag() << ')';
  return os;
}