ComplexNumbers Rectangular.java

public class Rectangular {

    double x, y;

    // Constructor
    Rectangular(){
        x = 0;
        y = 0;
    }

    Rectangular(double x, double y){
        this.x = x;
        this.y = y;
    }

    // Convert
    public Polar toPolar(){

        double r = Math.hypot(x, y);
        double argument = Math.atan2(y, x);

        if(x>=0 && y>=0){
            return new Polar(r, argument);
        }

        else if(x>=0 && y<0){
            return new Polar(r, -argument);
        }

        else if(x<0 && y>=0){
            return new Polar(r, Math.PI - argument);
        }
        else {
            return new Polar(r, Math.PI + argument);
        }

    }

        // Methods
        public static Rectangular multiplyRect(Rectangular rect1, Rectangular rect2){
            return new Rectangular(rect1.x*rect2.x - rect1.y*rect2.y, rect1.x*rect2.y + rect1.y*rect2.x);
        }

        public static Rectangular multiplyRectPol(Rectangular rect1, Polar pol2){
            Rectangular rect2 = pol2.toRectangular();
            return new Rectangular(rect1.x*rect2.x - rect1.y*rect2.y, rect1.x*rect2.y + rect1.y*rect2.x);

        }

}