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  1. object Main extends App {
  2.   def factorial(i: Int): Int = if (i == 1) i else i * factorial(i - 1)
  3.  
  4.   def calc(s: String): Double = {
  5.     var list = Seq.empty[Double]
  6.     s.split(" ").foreach(s => s match {
  7.       case "+" => 
  8.         val List(a, b, temp @ _*) = list
  9.         list = (b + a) +: temp
  10.       case "-" =>
  11.         val List(a, b, temp @ _*) = list
  12.         list = (b - a) +: temp
  13.       case "*" | "x" =>
  14.         val List(a, b, temp @ _*) = list
  15.         list = (b * a) +: temp
  16.       case "/" =>
  17.         val List(a, b, temp @ _*) = list
  18.         list = (b / a) +: temp
  19.       case "//" =>
  20.         val List(a, b, temp @ _*) = list
  21.         list = (b.toInt / a.toInt).toDouble +: temp
  22.       case "%" =>
  23.         val List(a, b, temp @ _*) = list
  24.         list = (b % a) +: temp
  25.       case "^" =>
  26.         val List(a, b, temp @ _*) = list
  27.         list = math.pow(b, a) +: temp
  28.       case "!" =>
  29.         val List(a, temp @ _*) = list
  30.         list = factorial(a.toInt).toDouble +: temp
  31.       case _ => list = s.toDouble +: list
  32.     })
  33.     if (list.size > 1) throw new IllegalArgumentException
  34.     else list.head
  35.   }
  36.   io.Source.stdin.getLines.foreach(l => println(calc(l)))
  37. }
Success #stdin #stdout 0.16s 322432KB
comments ()
stdin
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0.5 1 2 ! * 2 1 ^ + 10 + *
1 2 3 4 ! + - / 100 *
100 807 3 331 * + 2 2 1 + 2 + * 5 ^ * 23 10 558 * 10 * + + *
stdout
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7.0
-4.0
1.80055823E10
https://ideone.com/W9MEyh
language:
Scala (scala 2.12.8)
created:
8 years ago
visibility:
public

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