Kotlin Program:

Example:

import java.util.Scanner
fun main(args: Array<String>) {
  print("Enter your string : ")
  val userInput = Scanner(System.`in`)
  var s1:String
  var reverse:String=""
  s1=userInput.nextLine()
  var l:Int=s1.length-1

  while(l!=-1) {
    reverse+=s1[l--];
  }
  if(s1==reverse)println("Palindrome String");
  else println("Not a Palindrome String");
}

Output:

  Enter Your string : noon
  Palindrome String

You must know first,

Palindrome String : if a string & reverse of it are equal then the string is Palindrome string

Example :

String: "aba" & its Reverse = "aba" . so it's Palindrome
String: "abc" & its Reverse = "cba" . so it's NOT a Palindrome

//reverse the string
int l=s1.length-1;
while(l!=-1) {
  reverse+=s1[l--];
}

//check for the Palindrome
if(s1==reverse)