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.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double x1=sc.nextDouble();
        double y1=sc.nextDouble();
        double x2=sc.nextDouble();
        double y2=sc.nextDouble();
        double x3=x2-x1;
        double y3=y2-y1;
        double Lx,Ly,L=0;
        Lx=x3*x3;
        Ly=y3*y3;
        L=Lx+Ly;
        double k;
        k=Math.sqrt(L);
        System.out.println(k);
    }
}