Untitled

class Car {
  double _speed = 0.0;

  double get speed => _speed;

  set speed(double value) {
    if (value >= 0.0 && value <= 200.0) {
      _speed = value;
    }
  }
}

void main() {
  Car car = Car();
  car.speed = 100.0;
  print('Kecepatan Mobil: ${car.speed}km/h');
}