Описать класс Complex и перегрузить операторы

class complex
{
private:
    double re, im;
    
public:
    complex() {}
 
    complex(double real, double imaginary)
        : re(real), im(imaginary) {}
        
    friend std::ostream& operator<<(std::ostream& os, complex& cpl);
    
    friend std::istream& operator>>(std::istream& is, complex& cpl);
};
 
std::ostream& operator<<(std::ostream& os, complex& cpl)
{
    os << cpl.re << '+' << cpl.im << 'i';
}
 
std::istream& operator>>(std::istream& is, complex& cpl)
{
    is >> cpl.re >> cpl.im;
}

#include <iostream>
 
class complex
{
private:
    double re, im;
    
public:
    complex() {}
 
    complex(double real, double imaginary)
        : re(real), im(imaginary) {}
        
    friend std::ostream& operator<<(std::ostream& os, complex& cpl);
    
    friend std::istream& operator>>(std::istream& is, complex& cpl);
};
 
std::ostream& operator<<(std::ostream& os, complex& cpl)
{
    os << cpl.re << '+' << cpl.im << 'i';
}
 
std::istream& operator>>(std::istream& is, complex& cpl)
{
    is >> cpl.re >> cpl.im;
}
 
int main()
{
    complex c;
    std::cin >> c;
    std::cout << c << std::endl;
  
    return EXIT_SUCCESS;
}