Kotlin Program:

Example:

      *
    * *
  * * *
* * * * 

fun main(args: Array<String>) {
  print("Enter number of rows : ") 
  val userInput = readLine()!!
  var rows:Int =userInput.toInt()
  for(i in rows downTo 1) {
    for(j in 1..rows) {
      if(j<i)print("  ")
      else print("* ")
    }
    println("")
  }
}

Output:

  Enter number of rows : 4
        *
      * *
    * * *
  * * * *

Main logic :

for(i in rows downTo 1) {  //rows : number of rows to print
  for(j in 1..rows){
    if(j<i)print("  ")
    else print("* ")
  }
  println("")
}

You can print any thing in this pattern, just replace your value with *