#include <iostream.h>
#include <math.h>

class Imaginary_Number {
public:
  Imaginary_Number();  // This is the constructor
  double real_part();
  double imaginary_part();

  void add(double r, double i);
  void subtract(double r, double i);
  void multiply(double r, double i);
  void divide(double r, double i);

private:
  double real;
  double imaginary;
};

Imaginary_Number::Imaginary_Number()
{
  real = 0;
  imaginary = 0;
}

double Imaginary_Number::real_part()
{
  return(real);
}

double Imaginary_Number::imaginary_part()
{
  return(imaginary);
}

void Imaginary_Number::add(double r, double i)
{
  real += r;
  imaginary += i;
}

void Imaginary_Number::subtract(double r, double i)
{
  real -= r;
  imaginary -= i;
}

void Imaginary_Number::multiply(double r, double i)
{
  real = (real*r) - (imaginary*i);
  imaginary = (real*i) + (imaginary*i);
}

void Imaginary_Number::divide(double r, double i)
{
  real = (real/r) + (imaginary/i);
  imaginary = -(real/i) + (imaginary/r);
}

int main(void)
{
  Imaginary_Number x;
  Imaginary_Number y;

  x.add(3.0, 0.0);

  cout << "x = " << x.real_part()
       << "+" << x.imaginary_part()
       << "i\n";

  y.add(7.0, 1.0);

  cout << "y = " << y.real_part()
       << "+" << y.imaginary_part()
       << "i\n";

  x.add(y.real_part(), y.imaginary_part());

  cout << "x = " << x.real_part()
       << "+" << x.imaginary_part()
       << "i\n";

  y.add(1.0, 0.0);

  cout << "y = " << y.real_part()
       << "+" << y.imaginary_part()
       << "i\n";

  return(0);
}


Output:

ostrich% Imaginary
x = 3+0i
y = 7+1i
x = 10+1i
y = 8+1i
ostrich%