ComplexNumbers Polar.java

public class Polar {

    double r;
    double arg;

    // Constructor
    Polar(){
        r = 0;
        arg = 0;
    }

    Polar(double r, double arg){
        if(r ==0){
            System.out.println("Polar coordinates cannot be defined when x = 0 and y =0.");
            return;
        }

        else{
            this.r = r;
            this.arg = arg;
        }
    }

    // Convert
    public Rectangular toRectangular(){
        return new Rectangular(r * Math.cos(arg), r * Math.sin(arg));
    }

    // Methods
    public static Polar multiplyPol(Polar pol1, Polar pol2){
        return  new Polar(pol1.r * pol2.r, pol1.arg + pol2.arg);
    }

    public static Polar multiplyPolRect(Polar pol1, Rectangular rect2){
        Polar pol2 = rect2.toPolar();
        return  new Polar(pol1.r * pol2.r, pol1.arg + pol2.arg);
    }

}