It is also possible to match cases in range form. To make use of ranges, Kotlin provides the in operator. Using the in operator, we are asking for a value that is contained within a given range. This is specifically useful when more than one condition has the same result:

fun main(args: Array<String>) {
      val grade = "A"
     when (grade) {
         in "A".."E" -> println("You are promoted to the next level")
         "F" -> println("You need hard work.")
         else -> println("Invalid input")
     }
 }

In this example, if the student grade is within the range of A to E then a You are promoted to the next level message will be displayed. If the grade is F, then You need hard work. will be displayed on the screen; otherwise, Invalid input is displayed.