Chapter 2 Question 2.15, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

(Geometry: distance of two points) Write a program that prompts the user to enter two points (x1, y1) and (x2, y2) and displays their distance between them. The formula for computing the distance is √(x2 - x1)^2 + (y2 - y1)^2 . Note that you can use Math.pow(a, 0.5) to compute √a.

Solution

import java.util.Scanner;

public class Exercise_02_15 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        // Prompt the user to enter two points

        System.out.print("Enter x1 and y1: ");

        double x1 = input.nextDouble();

        double y1 = input.nextDouble();

        System.out.print("Enter x2 and y2: ");

        double x2 = input.nextDouble();

        double y2 = input.nextDouble();

        // Calculate the distance between the two points

        double distance = Math.pow(Math.pow(x2 - x1, 2) +

                                Math.pow(y2 - y1, 2), 0.5);

        // Display result

        System.out.println("The distance between the two points is " + distance);

    }

}