Skip to content

Module quiz: Structures and classes :Programming Fundamentals in Swift (Meta iOS Developer Professional Certificate) Answers 2026

Question 1

A struct is a value type. What does this mean?

✅ Each instance keeps a unique copy of its data
❌ Instances share a single copy of the data

Question 2

What is the output of the following code?

struct Employee {
var salary: Double
var tax = 0.2
mutating func deductTax() {
salary = salary - (tax * salary)
}
}
var emp = Employee(salary: 100)
emp.deductTax()
print(emp.salary)

❌ 20
❌ 100
✅ 80.0
❌ 0.2

Question 3

What is the output of the following code?

struct Tax {
var amount: Int = 5
}
var tax1 = Tax()
var tax2 = tax1
tax1.amount = 20
print("\(tax1.amount), \(tax2.amount)")

❌ 5, 5
✅ 20, 5
❌ 20, 20
❌ 5, 20

Question 4

What is the output of the following code?

class Product {
var price: Int = 5
}
var product1 = Product()
var product2 = product1
product1.price = 20
print("\(product1.price), \(product2.price)")

❌ 5, 20
✅ 20, 20
❌ 5, 5
❌ 20, 5

Question 5

What is the output of the following code?

class Vehicle {
var type: String
var noOfWheels: Int
init(type: String, wheels: Int) {
self.type = type
noOfWheels = wheels + 1
}
}
let car = Vehicle(type: "Jeep", wheels: 3)
print(car.type, "has", car.noOfWheels, "wheels")

❌ Jeep has 3 wheels
❌ Jeep has 5 wheels
✅ Jeep has 4 wheels

Question 6

What is the output of the following code?

class Square {
var width: Double = 0
var area: Double {
return width * width
}
}

let square = Square()
square.width = 2
print(square.area)

❌ 0.0
❌ 2.0
✅ 4.0

Question 7

Which of the following statements best describes the differences between structures and classes in Swift? (Select all that apply)

✅ Classes are known as reference types while structures are known as value types.
❌ Structures can use inheritance and by that extend the subclass.
✅ Structures come with an auto-generated memberwise initializer, while with classes you must create your own.

Question 8

Why should a structure be used as a starting point when creating a new data type and not a class? (Select all that apply)

❌ Because in Swift standard library you will find that reference types are primary used.
✅ Because a structure is a value type, and a class is a reference type.
✅ Because a local change in the code when using a structure will not affect other parts of the code.

Question 9

What are the correct statements regarding stored and computed properties in classes?

❌ A computed property is read-only
❌ A stored property is primary used when there is a need to encapsulate a block of computational code.
✅ A computed property does not store a value.

Question 10

When creating a class initializer, when would it be necessary to use the self keyword?

❌ When a class property is assigned a default value.
✅ When name of the property in the class is the same as the name of the parameters in the initializer.
❌ When there are more than 4 parameters in the class initializer.

🧾 Summary Table

Question Correct Answer
Q1 Each instance keeps a unique copy
Q2 80.0
Q3 20, 5
Q4 20, 20
Q5 Jeep has 4 wheels
Q6 4.0
Q7 1st & 3rd options
Q8 2nd & 3rd options
Q9 Computed property does not store value
Q10 When property & parameter names are same