1Ranges.kt

fun main() {
    for (i in 0..10) { print(i) } // 012345678910
    
    for (i in 1 until 10) { print(i) } // 123456789 (10 is excluded)
    
    for (i in 9 downTo 0) { print(i) } // 9876543210
    
    for (i in 2..20 step 2) { print("$i ") } // 2 4 6 8 10 12 14 16 18 20 
    
    if (50 in 0..100) println(true) else println(false) // true
    
    val list = listOf(1, 2, 3, 4, 5)
    if (3 in list) println("3 PRESENT") else println("3 ABSENT") // 3 PRESENT
    if (10 !in list) println("10 NOT PRESENT") else println("10 PRESENT") // 10 NOT PRESENT
}

2Ranges.kt

fun main() {
    val batteryPercentage = 90
    
    val message = when (batteryPercentage) {
        in 1..20 -> "Very low"
        in 21..50 -> "Low"
        in 51..80 -> "Medium"
        in 81..100 -> "Charged"
        else -> "Invalid"
    }
    
    println(message) // Charged
}