void main() {
  for (int i = 0; i < 5; i++) {
    print('hello ${i + 1}');
  }
  var bike = new Bicycle(2, 1);
  print(bike);
  bike.applyBrake(1);
  print(bike);
  bike.speedUp(8);
  print(bike);
}

class Bicycle {
  int cadence;
  int _speed = 0;
  int gear;
  
  Bicycle(this.cadence, this.gear);
//   Bicycle(this.cadence, this._speed, this.gear);
  int get speed => _speed;
  
  void applyBrake(int decrement) {
    _speed -= decrement;
  }
  
  void speedUp(int increment) {
    _speed += increment;
  }
  
  String toString() => 'Bicycle: $_speed mph';
}

// class Bicycle {
//   int cadence;
//   int speed;
//   int gear;
  
//   Bicycle(int cadence, int speed, int gear)
//     : this.cadence = cadence,
//       this.speed = speed,
//       this.gear = gear;
// }