Programming Fundamentals of Swift Coursera quiz answers

Introduction to Programming Fundamentals

1. If you were to store the balance of a bank account, which would be the best to store this in?

• A constant
• A variable

2. Which of the following would be ideal to store in a constant?

• The number of words in the English language.
• The number of pages in the English dictionary.
• The number of letters in the English alphabet.

3. The keyword var is used to declare what in Swift?

• A constant
• A variable

4. What operator do you use to check if two strings are the same?

• ==
• !=

5. Swift’s Strings are Unicode compliant.

• True
• False

6. Which operator means greater than?

• >
• <
• <=
• >=

7. Switch statements do require a default keyword.

• True
• False

8. A “for loop” can use ranges to define the number of loops.

• Yes
• No

9. Which of the following operators are used to define an optional?

• ?
• !

10. What is the output of the following code? 

1. let text = “text“
2. if let number = Int(text) {
3.   print(“The number is \(number).”)
4. } else {
5.   print(“Invalid number!”)
6. }

• Invalid number!
• The number is 4

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Data structures

Functions and closures

Structures and classes 

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

2. What is the output of the following code?

1. struct Employee {
2.   var salary: Double
3.   var tax = 0.2
4.   mutating func deductTax() {
5.     salary = salary – (tax * salary)
6.   }
7. }
8. var emp = Employee(salary: 100)
9. emp.deduct tax()
10. print(emp.salary)

• 0.2
• 20
• 80.0
• 100

3.  What is the output of the following code?

1. struct Tax {
2.   var amount: Int = 5
3. }
4. var tax1 = Tax()
5. var tax2 = tax1
6. tax1.amount = 20
7. print(“\(tax1.amount), \(tax2.amount)”)

• 5, 5
• 20, 5
• 20, 20
• 5, 20

4. What is the output of the following code?

1. class Product   {
2.   var price: Int = 5
3. }
4. var product1 = Product()
5. var product2 = product1                        
6. product1.price = 20
7. print(“\(product1.price), \(product2.price)”)

• 5, 5
• 20, 5
• 20, 20
• 5, 20

5. What is the output of the following code?

1. class Vehicle {
2.   var type: String
3.   var noOfWheels: Int
4.   init(type: String, wheels: Int) {
5.     self.type = type
6.     noOfWheels = wheels + 1
7.   }
8. }
9. let car = Vehicle(type: “Jeep“, wheels: 3)
10. print(car. type, “has“, car.noOfWheels, “wheels“)

• Jeep has 4 wheels
• Jeep has 3 wheels
• Jeep has 5 wheels

6.  What is the output of the following code?

1. class Square {
2.   var width: Double = 0
3.   var area: Double {
4.     return width * width
5.   }
6. }
7. let square = Square()
8. square.width = 2
9. print(square.area)

• 2.0
• 4.0
• 0.0

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 come with an auto-generated memberwise initializer, while with classes you must create your own.
• Structures can use inheritance and by that extend the subclass.

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

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.

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

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

Final graded quiz: Programming fundamentals

PROGRAMMING IN PYTHON COURSERA QUIZ ANSWERS