complex number (class example)

#include <iostream>
#include <cstdlib>
#include <cmath>

using namespace std;

class NbComplexe
{
public:


    NbComplexe();
    NbComplexe(float re, float im);
    NbComplexe(NbComplexe const&);
    ~NbComplexe();

    void input ()
    {
        cout << "Saisir la partie réelle: ";
        cin >> re;
        cout << "Saisir la partie imaginaire: ";
        cin >> im;
    }

    void output ()
    {
        if (im >= 0) { cout << re << "+" << im << "i" << endl; }
        else { cout << re << "-" << abs(im) << "i" << endl; }
    }

    float real() const
    {
        return re;
    }

    float imaginary() const
    {
        return im;
    }

private:
    float re, im;

};

NbComplexe::NbComplexe(void)
{
    re = 0;
    im = 0;
}

NbComplexe::NbComplexe(float real, float imaginary)
{
    re = real;
    im = imaginary;
}

NbComplexe::NbComplexe(NbComplexe const &nb_complexe)
{
    re = nb_complexe.real();
    im = nb_complexe.imaginary();
}

NbComplexe::~NbComplexe()
{

}




int main (int, char**)
{
    NbComplexe* complexe1 = new NbComplexe();
    complexe1->input();
    complexe1->output();
    system("pause");
    return 0;
}