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 ITP1_10_A{
    class sample{
        static void Main(string[] args){
            var coordinate = Console.ReadLine().Split(' ');
            double column = double.Parse(coordinate[3]) - double.Parse(coordinate[1]);
            double row = double.Parse(coordinate[2]) - double.Parse(coordinate[0]);
            double distance = column*column + row*row;
            Console.WriteLine(Math.Sqrt(distance));
        }
    }
}