Swift Control Flow Quiz

Find out if you understand how control flow works in Swift with this quiz.

Which of the following describes control flow in programming?

Writing code that handles user interface

Writing code that makes decisions based on criteria

Writing code that manages memory

Writing code that defines the flow of user input

None

What are the two primary types of control flow in Swift?

Input control flow and Output control flow

Input validation and Output formatting

Looping control flow and conditional control flow

Memory control flow and Performance control flow

None

Which of the following is the correct syntax for a for-in loop in Swift?

repeat {
    // code 
} while condition

for constantName in collection { 
    // code 
}

for (var i = 0; i < 10; i++) {
    // code 
}

while condition {
    // code 
}

None

In the following Swift for-in loop, what is the role of the index constant?

for index in 1...5 {
    print("Value of index is \(index)")
}

It determines how many times the loop will execute

It is the current value in the range being iterated

It stores the collection being iterated

It stores the result of the loop

None

What is the purpose of using an underscore (_) in a for-in loop in Swift?

To indicate the loop should stop early

To ignore the current item and not use it within the loop

To handle errors within the loop

To declare a variable that will be modified within the loop

None

When is a while loop preferred over a for-in loop in Swift?

When the loop only needs to run once

When the number of iterations is unknown and depends on a condition

When the loop should run indefinitely

When the number of iterations is known in advance

None

What will the following code output?

var count = 0

while count < 3 {
    count += 1
    print("Count is \(count)")
}

Count is 1, Count is 2, Count is 3

Count is 0, Count is 1, Count is 2, Count is 3

Count is 0, Count is 1, Count is 2

Count is 1, Count is 2

None

What differentiates a repeat…while loop from a while loop in Swift?

repeat…while guarantees that the loop body is executed at least once

repeat…while checks the condition before executing the loop body

repeat…while is faster than a while loop

repeat…while does not require a condition

None

Which of the following is the correct syntax for a repeat…while loop in Swift?

repeat (condition); 
{
    // code 
}

do { 
    // code 
} while condition

for { 
    // code 
} while condition

repeat { 
    // code 
} while condition

None

10.

In the following code, how many times will the loop execute?

var i = 3

repeat {
    print(i)
    i -= 1
} while i > 0

3 times

1 time

0 times

2 times

None

11.

Which Swift statement allows breaking out of a loop before its completion criteria are met?

stop

exit

continue

break

None

12.

What will the following code output?

var j = 10

for _ in 0..<5 {
    j += j

    if j > 50 {
        break
    }

    print("j = \(j)")
}

j = 20, j = 40

j = 20

j = 20, j = 40, j = 80

j = 10, j = 20, j = 30, j = 40

None

13.

Which Swift statement causes the remaining code in a loop iteration to be skipped and the next iteration to begin?

skip

return

continue

break

None

14.

What will the following code output?

var i = 1

while i < 5 {

    i += 1

    if i % 2 != 0 {

        continue

    }

    print("i = \(i)")

}

i = 1, i = 3

i = 2, i = 3

i = 2, i = 4

i = 1, i = 2, i = 3, i = 4

None

15.

Which of the following describes the primary use of the if statement in Swift?

Handling errors

Allocating memory

Making decisions based on Boolean expressions

Iterating over collections

None

16.

Which of the following is the correct syntax for an if…else statement in Swift?

if (boolean expression) {
    // code 
}; 
else { 
    // code 
}

if boolean expression:
    // code 
else 
    // code

when boolean expression {
    // code 
} else { 
    // code 
}

if (boolean expression) { 
    // code 
} else { 
    // code 
}

None

17.

In Swift, what are the main benefits of using a switch statement over multiple if…else statements?

It handles errors more efficiently

It improves readability when evaluating multiple conditions

It is faster than if…else

It reduces the need for code repetition

It allows iteration over collections

18.

Which of the following best describes the guard statement in Swift?

It repeats code execution until a condition is met

It ensures that code always executes

It provides a way to exit early from a function or loop if a condition is not met

It is used to handle errors

None

19.

What must a guard statement in Swift always include?

A continue statement

A loop

A Boolean expression

An else clause

None

20.

What will the following function output when called with multiplyByTen(value: 10)?

func multiplyByTen(value: Int?) {

    guard let number = value, number < 10 else {
        print("Number is too high")
        return
    }

    let result = number * 10
    print(result)
}

Number is too high

No outlout

100

None

21.

What is the key difference between using guard and if for optional binding in Swift?

Variables unwrapped using guard are available outside of the statement

guard does not allow optional binding

guard cannot handle nil values

if requires the optional to be nil

None

22.

What is the primary purpose of the continue statement in Swift loops?

To execute the loop indefinitely

To handle errors in the loop

To skip the remaining code in the current iteration and move to the next iteration

To break out of the loop early

None

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