import java.util.Locale;

public class Vector2D {
    public double vX, vY;

    public Vector2D() {
        this.vX = 1.0;
        this.vY = 1.0;
    }

    public Vector2D(double x, double y) {
        this.vX = x;
        this.vY = y;
    }

    public Vector2D(Vector2D vector) {
        this.vX = vector.vX;
        this.vY = vector.vY;
    }

    public void print() {
        System.out.println("(" + String.format(Locale.US, "%.2f", vX) + ", " + String.format(Locale.US, "%.2f", vY) + ")");
    }
    public void add(Vector2D vector) {
        this.vX += vector.vX;
        this.vY += vector.vY;
    }
    public void sub(Vector2D vector) {
        this.vX -= vector.vX;
        this.vY -= vector.vY;
    }
    public double length(){
        return Math.pow(Math.pow(this.vX, 2) + Math.pow(this.vY, 2), 0.5);
    }
    public void scale(double scale) {
        this.vX *= scale;
        this.vY *= scale;
    }
    public void normalized() {
        this.vX = this.vX / this.length();
        this.vY = this.vY / this.length();
    }
}