June 2018 Update

Task/Self-describing-numbers/Scala/self-describing-numbers.scala

@@ -0,0 +1,14 @@
+object SelfDescribingNumbers extends App {
+  def isSelfDescribing(a: Int): Boolean = {
+    val s = Integer.toString(a)
+
+    (0 until s.length).forall(i => s.count(_.toString.toInt == i) == s(i).toString.toInt)
+  }
+
+  println("Curious numbers n = x0 x1 x2...x9 such that xi is the number of digits equal to i in n.")
+
+  for (i <- 0 to 42101000 by 10
+       if isSelfDescribing(i)) println(i)
+
+  println("Successfully completed without errors.")
+}