public class Punkt{

    private double x;
    private double y;

    public Punkt(double x, double y) {
        this.x = x;
        this.y = y;
    }
    public Punkt przesuniecie(double a, double b) {
        this.x += a;
        this.y += b;
        return this;
    }
    public double odlegloscOdPocz() {
            this.x = x;
            this.y = y;
           return Math.sqrt(Math.pow(this.x , 2) + Math.pow(this.y , 2));
    }
    public String toString() {

        return "(" + x + ", " + y + ")";
    }
}