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: Wrong Answer)


import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        double x1 = scan.nextDouble();
        double x2 = scan.nextDouble();
        double y1 = scan.nextDouble();
        double y2 = scan.nextDouble();
        double a;
        double b;

        a = x2 - x1;
        b = y2 - y1;
        double c = Math.sqrt(a * a + b * b);
        System.out.printf("% 8f", c);
    }

}