public class Main {
    public static void main(String[] args) {
        Point p = new Point(5, 6);
        Point q = new Point(-1, -8);
        LineSegment l = new LineSegment(p, q);
        System.out.println(l);
        System.out.println("The midpoint of ths line segment is: " + l.midpoint());
        System.out.println("The length of this lin segment is: " + l.lengthOfSegment());
        System.out.println("The slope of this line segment is: " + l.slope());
    }
}

class Point {
    double x;
    double y;

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

    double distanceFromOrigin() {
        return Math.sqrt(x * x + y * y);
    }

    public String toString() {
        return "(" + x + ", " + y + ")";
    }

}

class LineSegment {
    Point a;
    Point b;

    public LineSegment(Point a, Point b) {
        this.a = a;
        this.b = b;
    }

    public String toString() {
        return "LIne segment from " + a + " to " + b;
    }

    double lengthOfSegment() {
        return Math.sqrt(Math.pow(a.x - b.x, 2) + Math.pow(a.y - b.y, 2));
    }

    Point midpoint() {
        return new Point((a.x + b.x) / 2, (a.y + b.y) / 2);
    }

    double slope() {
        return (a.y - b.y) / (a.x - b.x);
    }
}