Question

**Java Programming Question**

A class that implements a data type, “Point,” which has the following constructor:

Point(double x, double y, double z)

• and, the following API:
  • double distanceto(Point q)
    • it returns the Euclidean distance between this and q.
      • The Euclidean distance between (x1, y1, z1) and (x2, y2, z2) is defined as sqrt( (x1-x2)^2 + (y1-y2)^2) + (z1-z2)^2).
  • String toString() – it returns the string representation of the point. An example would be (2.3,4.5,3.0).
  • Write a main method in the class that is used to test it.
    • It should create two Point objects using input provided by the user on the command-line.
    • Then it should print out the two points followed by their Euclidean distance

A sample run would be as follows.

>java Point 2.1 3.0 3.5 4 5.2 3.5
The first point is (2.1,3.0,3.5)
The second point is (4.0,5.2,3.5)
Their Euclidean distance is 2.90

**Java Programming Question**

Answer 1

// do comment if any problem arises

//code

class Point {

    double x, y, z;

    Point(double x, double y, double z) {

        this.x = x;

        this.y = y;

        this.z = z;

    }

    public String toString() {

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

    }

    // this function finds sqareroot without using library function

    public double sqrt(double input) {

        double n;

        // value to return

        double ret = input / 2;

        do {

            n = ret;

            ret = (n + (input / n)) / 2;

        } while ((n - ret) != 0);

        return ret;

    }

    // this function returns euclidian distance between this and q

    double distanceto(Point q) {

        double distance = (x - q.x) * ((x - q.x)) + (y - q.y) * ((y - q.y)) + (z - q.z) * ((z - q.z));

        Point temp=new Point(0,0,0);

        return temp.sqrt(distance);

    }

    public static void main(String[] args) {

        double x, y, z;

        x = Double.parseDouble(args[0]);

        y = Double.parseDouble(args[1]);

        z = Double.parseDouble(args[2]);

        // create first point

        Point first = new Point(x, y, z);

        x = Double.parseDouble(args[3]);

        y = Double.parseDouble(args[4]);

        z = Double.parseDouble(args[5]);

        // create second point

        Point second = new Point(x, y, z);

        // print first point

        System.out.println("The first point is " + first);

        // print second point

        System.out.println("The second point is " + second);

        System.out.print("Their Euclidian distance is ");

        // print distance

        System.out.printf("%.2f", first.distanceto(second));

    }

}

Output:

The first point is (2.1,3.0,3.5) The second point is (4.0,5.2,3.5) Their Euclidian distance is 2.91