宿題

divisor.kt

fun divisor(val a: Int,val b: Int) : Int = if(b == 0) a else divisor(b, a % b)

fun main(args: Array<String>){
  test(1, divisor(1, 1))
  test(2, divisor(2, 4))
  test(2, divisor(4, 2))
  test(6, divisor(24, 18))
  test(6, divisor(18, 24))
  test(1, divisor(13, 19))
  test(1, divisor(19, 13))
}

fun test(expected : Int, actual : Int) {
  if(expected != actual)
    throw AssertionError("expected $expected, but actual $actual")
}