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#if !defined COMPLEX_H 
#define COMPLEX_H 
//------------------------------------ 
//  complex.h 
//  Complex number 
//  (c) Reliable Software, 1996 
//------------------------------------ 
 
#include  
 
class Complex 
{ 
public: 
    Complex () {} 
    Complex (double re): _re(re), _im(0.0) {} 
    Complex (double re, double im): _re(re), _im(im) {} 
    double Re () const { return _re; } 
    double Im () const { return _im; } 
    void operator += (const Complex& c) 
    { 
        _re += c._re; 
        _im += c._im; 
    } 
    void operator -= (const Complex& c) 
    { 
        _re -= c._re; 
        _im -= c._im; 
    } 
    void operator *= (const Complex& c) 
    { 
        double reT = c._re * _re - c._im * _im; 
        _im = c._re * _im + c._im * _re; 
        _re = reT; 
    } 
    Complex operator- ()  
    { 
            return Complex (-_re, -_im); 
    } 
    double Mod () const { return sqrt (_re * _re + _im * _im); } 
private: 
    double _re; 
    double _im; 
}; 
 
#endif