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 Scala (judge verdict: Accepted)

/**
  * http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=ITP1_10_A&lang=jp
  * Math Functions - Distance
  */
object Main {
  def main(args: Array[String]): Unit = {
    val Array(x1, y1, x2, y2) = io.StdIn.readLine().split(" ").map(_.toDouble)
    val d = math.sqrt(math.pow(x1 - x2, 2) + math.pow(y1 - y2, 2))
    println(d)
  }
}