/** Complex - implements a complex number
*/
public final class Complex
{
    private double real,        // the real part
                   imag;        // the imaginary

    public Complex(double r, double i)
    {
        real = r;
        imag = i;
    }
    public Complex(Complex c)
    {
        real = c.real;
        imag = c.imag;
    }
    public double getReal() { return real; }

    public double getImag() { return imag; }

    public Complex add(Complex c)
    {
        real += c.real;
        imag += c.imag;
        return this;
    }
    public Complex multiply(Complex c)
    {
        double temp = real*c.real - imag*c.imag;

        imag = real*c.imag + imag*c.real;
        real = temp;
        return this;
    }
    public double sizeSquared()
    {
        return real*real + imag*imag;
    }
}