package bhylu.lessons.k_hire_project

class HireCounter(val capacity: Int) {
    init { require(capacity >= 0) }
    var hired = 0
        private set
    val free: Int get() = capacity - hired
    fun hire(amount: Int): Boolean {
        if (amount <= 0 || amount > free) return false
        hired += amount
        return true
    }
}

fun main() {
    val desk = HireCounter(5)
    for (amount in listOf(2, 0, 4, 3)) {
        println("${desk.hire(amount)} ${desk.hired}")
    }
    println("free=${desk.free}")
}