Read the following Swift code and then answer the questions that follow. Write y
ID: 3909432 • Letter: R
Question
Read the following Swift code and then answer the questions that follow. Write your answers in blank space anywhere near the corresponding question.
class Dog {
let name: String
var energy: Int
var happiness: Int
var isContent: Bool { return energy > 5 && happiness > 5 }
init(name: String) {
self.name = name
energy = 10
happiness = 10
}
func eat() {
energy += 3
happiness += 3
daydream()
}
func run() { energy -= 5 }
private func daydream() { happiness += 3 }
}
class GoldenRetriever: Dog {
var loyalty = 10
override var isContent: Bool { return super.isContent && loyalty > 5 }
override func eat() {
super.eat()
loyalty += 1
}
func playWithOwner() { loyalty += 5 }
}
let rufus = Dog(name: "Rufus")
let duke = GoldenRetriever(name: "Duke")
A. What is printed to the console after the following code executes?
rufus.run()
rufus.eat()
rufus.run()
print(rufus.isContent)
print(rufus.energy)
B. Why will each of these two lines produce an error?
rufus.playWithOwner()
rufus.daydream()
Explanation / Answer
If you have any doubts, please give me comment....
1)
rufus.run() --> it decrements happiness property with 5 value i.e., happiness = 5
rufus.eat() --> it incrementa 3 by three properties i.e.,energy =13, happiness = 8, again increments happiness = 11
rufus.run() --> it decrements happiness property with 5 value i.e., happiness = 6
print(rufus.isContent) --> true
print(rufus.energy) --> 13
output:
true
13
2)
rufus has class of Dog, but Dog class doesn't have playWithOwner method, it will generates error...
rufus.daydream() is private method, it can't access outside of class, it will be access only inherited class and self class
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