/* Code of Figure 10.14, page 445 from
   Kenneth C. Louden, Programming Languages
   Principles and Practice 2nd Edition
   Copyright (C) Brooks-Cole/ITP, 2003
   Test code from pages 445-446 also added
*/

#include <iostream>
using std::cout;
using std::endl;

class Complex
{
public:
  Complex(double r = 0, double i = 0)
  : re(r), im(i) { }

  double realpart() { return re; }

  double imaginarypart() { return im; }

  Complex operator-() // unary minus
  { return Complex( -re, -im); }

  Complex operator+( Complex y)
  { return Complex( re + y.realpart(),
                    im + y.imaginarypart());
  }

  Complex operator-(Complex y) // subtraction
  { return Complex( re - y.realpart(),
                    im - y.imaginarypart());
  }

  Complex operator*(Complex y)
  { return Complex(re * y.realpart() - im * y.imaginarypart(),
                   im * y.realpart() + re * y.imaginarypart());
  }

private:
  double re,im;
};

int main()
{ Complex z(1,2);
  Complex w(-1,1);
  Complex x = z + w;
  Complex i(0,1); // i constructed as (0,1)
  Complex y; // y constructed as default (0,0)
  Complex xx(1); // xx constructed as (1,0)
  cout << z.realpart() << " + i " << z.imaginarypart() << endl;
  cout << w.realpart() << " + i " << w.imaginarypart() << endl;
  cout << x.realpart() << " + i " << x.imaginarypart() << endl;
  cout << i.realpart() << " + i " << i.imaginarypart() << endl;
  cout << y.realpart() << " + i " << y.imaginarypart() << endl;
  cout << xx.realpart() << " + i " << xx.imaginarypart() << endl;
  return 0;
}