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Swift MCQs

Use the classes defined above to create a new Person instance, and try to access its numberOfRooms property as before?

let john = Person() if roomCount = john.residence?.numberOfRooms { println("John's residence has \(roomCount) room(s).") }else{ println("Unable to retrieve the number of rooms.") }

let john = Person() if let roomCount = john.residence?.numberOfRooms { println("John's residence has \(roomCount) room(s).") }else{ println("Unable to retrieve the number of rooms.") }

let john = Person() if roomCount = john-let.residence?.numberOfRooms { println("John's residence has \(roomCount) room(s).") }else{ println("Unable to retrieve the number of rooms.") }

john = Person() if roomCount = john-let.residence?.numberOfRooms { println("John's residence has \(roomCount) room(s).") }else{ println("Unable to retrieve the number of rooms.") }

Answer

Correct Answer: let john = Person() if let roomCount = john.residence?.numberOfRooms { println("John's residence has \(roomCount) room(s).") }else{ println("Unable to retrieve the number of rooms.") }

Explanation:

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