Une version Kotlin d'une solution vachement chouette au problème classique des nombres arabes exprimés avec des chiffres romains

arabian_to_roman.kt

val MAPPINGS = java.util.TreeMap(mapOf(1 to "I",
                          4 to "IV",
                          5 to "V",
                          9 to "IX",
                          10 to "X",
                          40 to "XL",
                          50 to "L",
                          90 to "XC",
                          100 to "C",
                          400 to "CD",
                          500 to "D",
                          900 to "CM",
                          1000 to "M"))

fun toRoman(number:Int, text:String = ""):String {
    var entry = MAPPINGS.floorEntry(number)
    return when(entry) {
		null -> text + ""
        else -> toRoman(number - entry.key, text + entry.value)
    }
}

fun toRomanExplained(number:Int):String = String.format("%d = %s", number, toRoman(number))

fun main() {
    for(index in 1..1000)
	    println(toRomanExplained(index))
}