카타 8급 Twice as old

1 C++

int twice_as_old(int dad, int son) {
  return abs(dad-son*2);
}

2 Kotlin

fun twiceAsOld(dadYearsOld: Int, sonYearsOld: Int) = Math.abs(dadYearsOld - sonYearsOld * 2)

fun twiceAsOld(dadYearsOld: Int, sonYearsOld: Int) = if (dadYearsOld >= 2 * sonYearsOld) dadYearsOld - 2 * sonYearsOld else 2 * sonYearsOld - dadYearsOld