Scala Programming: Count and print all the duplicates in the input string

Last update on June 11 2025 13:12:16 (UTC/GMT +8 hours)

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

Sample Solution:

Scala Code:

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);
  }
}

Sample Output:

The given string is: w3resource
The duplicate characters and counts are: 
e  appears  2  times
r  appears  2  times
The given string is: The Scala Programming Language
The duplicate characters and counts are: 
   appears  3  times
a  appears  5  times
e  appears  2  times
g  appears  4  times
m  appears  2  times
n  appears  2  times
r  appears  2  times

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