백준 - 10872 팩토리얼

문제

10872 팩토리얼

답

kotlin code

fun main() {
    q10872()
}

fun q10872() {
    val n = readln().toInt()
    println(factorial(n))
}

tailrec fun factorial(n:Int, acc:Int = 1): Int = when(n){
    0 -> acc
    else -> factorial(n - 1, acc * n)
}