Complex Number Class, C++ (gcc)

Complex Number Class

//Title of this code
//g++  4.9.2

#include <iostream>

using namespace std;

class Complex{
 double re;
 double im;
 public:
    // Complex(){re=0;im=0;}
    Complex(double x=0,double y=0){re=x;im=y;}
    Complex operator+(const Complex&);
    Complex operator-(const Complex&);
    Complex operator%(const Complex&){return Complex();}
    void operator=(const Complex&);
    double Get_reel(){return re;}
    double Get_im(){return im;}
    friend ostream& operator<<(ostream&, const Complex&);
    friend istream& operator>>(istream&, const Complex&);
};
//Complex::Complex(): re=0,im=0{}
Complex Complex::operator+(const Complex& sayi){
   double re_num,im_num;
   re_num=re+sayi.re;
   im_num=im+sayi.im;
   return Complex(re_num,im_num);

}

Complex Complex::operator-(const Complex& sayi){
   double re_num,im_num;
   re_num=re-sayi.re;
   im_num=im-sayi.im;
   return Complex(re_num,im_num);

}

void Complex::operator=(const Complex& sayi){
   
   this->re=sayi.re;
   this->im=sayi.im;
 }
 
  ostream& operator<<(ostream& out, const Complex& C){
  out<<C.re<<"+"<<C.im<<"i"<<endl;
    return out;
   }
 istream& operator>>(istream& in, const Complex& C){ 
  //cout<<"Enter  number 1: ";
  in>>C.re;
 // in.ignore(3);
  //cout<<"Enter number 2: ";
   in>>C.im ;
  // in.ignore();
    return in;
 }
 
 
 
int main()
{
    Complex A(5,3),B(1.5,2.7);
  cout<<A<<endl<<B<<endl;
  Complex C;
 C=A+B;
 //cout<<C;
 cin>>C;
}


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