Problem:
Distance

Write a program which calculates the distance between two points P1(x1, y1) and P2(x2, y2).

Input

Four real numbers x1, y1, x2 and y2 are given in a line.

Output

Print the distance in real number. The output should not contain an absolute error greater than 10-4.

Sample Input

0 0 1 1

Sample Output

1.41421356

Solution in JAVA (judge verdict: Accepted)

import java.util.*;
import java.math.BigDecimal;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        double x1, x2, y1, y2;
        x1 = sc.nextDouble();
        y1 = sc.nextDouble();
        x2 = sc.nextDouble();
        y2 = sc.nextDouble();
        double d = Math.sqrt(Math.pow((x2-x1),2)+Math.pow((y2-y1),2));
        BigDecimal bd = new BigDecimal(d);
        BigDecimal ans = bd.setScale(5,BigDecimal.ROUND_DOWN);
        System.out.println(ans);
    }
}