class Complex {
    private double real;
    private double imaginary;

    // constructor
    public Complex() {
	real = 0.0;
	imaginary = 0.0;
    }

    // Constructor that takes parameters
    public Complex(double r, double i) {
	real = r;
	imaginary = i;
    }

    // add
    public Complex add(Complex c2) {
	Complex sum = new Complex();

	sum.real = real + c2.real;
	sum.imaginary = imaginary + c2.imaginary;

	return sum;
    }
    
    // multiply
    public Complex multiply(Complex c2) {
	Complex product = new Complex();

	product.real = real*c2.real - imaginary*c2.imaginary;
	product.imaginary = real*c2.imaginary + imaginary*c2.real;

	return product;
    }

    // subtract
    // divide
    // exponent

    // toString()
    public String toString() {
	String s = "";

	s = s + real + "+" + imaginary + "i";

	return s;
    }
}