//complex0.h
void set_real() {std::cin >> real;}
void set_imag() {std::cin >> imag;}
friend std::ostream & operator<<(std::ostream & os, const Complex0 & c);
friend std::iostream & operator>>(std::iostream & os, Complex0 & c);

//complex0.cpp
std::ostream & operator<<(std::ostream & os, const Complex0 & c)
{
    os << "(" << c.real <<  ", " << c.imag << "i)";
    return os;
}

std::iostream & operator<<(std::iostream & os, Complex0 & c)
{
    os << "Podaj czesc rzeczywista: ";
    c.set_real();
    os << endl << "Podaj czesc urojona: ";
    c.set_imag();
    os << endl;
    return os;
}