Data commit

Task/Commatizing-numbers/Scala/commatizing-numbers.scala

@@ -0,0 +1,27 @@
+import java.io.File
+import java.util.Scanner
+import java.util.regex.Pattern
+
+object CommatizingNumbers extends App {
+
+  def commatize(s: String): Unit = commatize(s, 0, 3, ",")
+
+  def commatize(s: String, start: Int, step: Int, ins: String): Unit = {
+    if (start >= 0 && start <= s.length && step >= 1 && step <= s.length) {
+      val m = Pattern.compile("([1-9][0-9]*)").matcher(s.substring(start))
+      val result = new StringBuffer(s.substring(0, start))
+      if (m.find) {
+        val sb = new StringBuilder(m.group(1)).reverse
+        for (i <- step until sb.length by step) sb.insert(i, ins)
+        m.appendReplacement(result, sb.reverse.toString)
+      }
+      println(m.appendTail(result))
+    }
+  }
+
+  commatize("pi=3.14159265358979323846264338327950288419716939937510582" + "097494459231", 6, 5, " ")
+  commatize("The author has two Z$100000000000000 Zimbabwe notes (100 " + "trillion).", 0, 3, ".")
+
+  val sc = new Scanner(new File("input.txt"))
+  while (sc.hasNext) commatize(sc.nextLine)
+}