Write a Scala program to count and print all the duplicates in the input string

object Scala_String {

  def showDuplicates(str1: String): Unit = {
    val MAX_CHARS = 256;
    val ctr = new Array[Int](MAX_CHARS);
    for (i <- 0 to str1.length - 1)
      ctr(str1.charAt(i)) = ctr(str1.charAt(i)) + 1;
    for (i <- 0 to MAX_CHARS - 1)
      if (ctr(i) > 1)
        printf("%c  appears  %d  times\n", i, ctr(i));
  }

  def main(args: Array[String]): Unit = {
    val str1 = "w3resource";
    println("The given string is: " + str1);
    println("The duplicate characters and counts are: ");
    showDuplicates(str1);
    val str2 = "The Scala Programming Language";
    println("The given string is: " + str2);
    println("The duplicate characters and counts are: ");
    showDuplicates(str2);
  }
}