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  1. object Main extends App {
  2.   def reverseFactorial(n: Float, pow: Int = 0): String = {
  3.     n match {
  4.       case 1.0 => s" = $pow!"
  5.       case x if x < 1.0 => "  NONE"
  6.       case _ => reverseFactorial(n / (pow + 1), pow + 1)
  7.     }
  8.   }
  9.  
  10.   List(120, 150, 3628800, 479001600, 6, 18)
  11.     .map(x => s"$x${reverseFactorial(x)}")
  12.     .foreach(println)
  13. }
Success #stdin #stdout 0.15s 322432KB
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Standard input is empty
stdout
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120 = 5!
150  NONE
3628800 = 10!
479001600 = 12!
6 = 3!
18  NONE
https://ideone.com/6QtzMd
language:
Scala (scala 2.12.8)
created:
7 years ago
visibility:
public

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