Chapter 2 Exercise 15, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

2.15 (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 2a. Here is a sample run:
Enter x1 and y1: 1.5 -3.4
 Enter x2 and y2: 4 5
The distance between the two points is 8.764131445842194

import java.util.Scanner;
 
public class ProgrammingEx2_15 {
 
 public static void main(String[] args) {
 
  Scanner input = new Scanner(System.in);
 
  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();
  double distance = Math.sqrt(Math.pow((x2 - x1), 2)
    + Math.pow((y2 - y1), 2));
  System.out.print("The distance between the two points is  " + distance);
 
 }
}