#include <iostream>

class Complex
{
public:
    double re;
    double im;
 
    Complex(double real=0, double imag=0): re(real), im(imag) {};
 
    //supraîncărcarea  operatorilor +, - ca functii de tip "friend" 
    friend Complex operator+(const Complex& s, const Complex& d);
    friend Complex operator-(const Complex& s, const Complex& d);
    
    //funcţii operator pentru supraîncărcarea operatorilor de intrare/ieşire  
    //declarate ca funcţii de tip "friend"   
    friend std::ostream& operator<< (std::ostream& out, const Complex& z);
    friend std::istream& operator>> (std::istream& is, Complex& z);
};