public class Complex
{
    private double real,        // the real part
                   imag;        // the imaginary

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

    public double getImag() { return this.imag; }

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

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