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 C# (judge verdict: Accepted)

using System;

namespace AOJ.ITP
{
    public class Distance
    {
        public static void Main()
        {
            var input = Console.ReadLine().Split(' ');
            double x1 = double.Parse(input[0]);
            double y1 = double.Parse(input[1]);
            double x2 = double.Parse(input[2]);
            double y2 = double.Parse(input[3]);

            double x = Math.Abs(x1 - x2);
            double y = Math.Abs(y1 - y2);
            Console.WriteLine(Math.Sqrt(x * x + y * y));
        }
    }
}