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protocol RoadDrivable {
func driveOnRoad()
}
protocol WaterDrivable {
func driveOnWater()
}
protocol Flyable {
func flyOnAir()
}
class SmartVehicle {
func talk() {
print("Hi! I am the smart talking vehicle!")
}
}
class SmartCar: SmartVehicle, RoadDrivable {
func driveOnRoad() {
print("Vroom!")
}
}
class SmartBoat: SmartVehicle, WaterDrivable {
func driveOnWater() {
print("I can run over water, because I can! B-)")
}
}
class SmartPlane: SmartVehicle, Flyable {
func flyOnAir() {
print("Wohoo! I am flying high!")
}
}
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