Type conversion is always explicit in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to convert an Int to a String explicitly.

Swift

let number = 42
let text = String([1])

Drag options to blanks, or click blank then click option'

Anumber

BInt(number)

C"number"

DtoString(number)

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the variable name, which makes it a string literal.

Trying to use a function like toString which doesn't exist in Swift.

Using Int(number) which is redundant and incorrect here.

In Swift, to convert an Int to a String, you use String(number). This is an explicit conversion.

2fill in blank

medium

Complete the code to convert a String to an Int explicitly.

Swift

let text = "123"
let number = Int([1])

Drag options to blanks, or click blank then click option'

A123

Btext

C"text"

DString(text)

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number literal instead of the variable.

Putting quotes around the variable name, making it a string literal.

Trying to convert a String to String again.

To convert a String to an Int in Swift, use Int(text). This returns an optional Int.

3fill in blank

hard

Fix the error in the code by completing the explicit conversion.

Swift

let pi = 3.14
let integerPi = [1](pi)

Drag options to blanks, or click blank then click option'

AFloat

BString

CDouble

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using String() which converts to text, not number.

Using Double() which does not change the type.

Using Float() which is a different floating-point type.

To convert a Double to an Int explicitly, use Int(pi). This truncates the decimal part.

4fill in blank

hard

Fill both blanks to convert a String to a Double explicitly and then to an Int.

Swift

let text = "56.78"
if let doubleValue = [1](text) {
    let intValue = [2](doubleValue)
}

Drag options to blanks, or click blank then click option'

ADouble

BInt

CString

DFloat

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to convert String directly to Int without Double.

Using String() instead of Double() for the first conversion.

Using Float() instead of Double() for the first conversion.

First convert the String to a Double using Double(text). Then convert the Double to an Int using Int(doubleValue).

5fill in blank

hard

Fill all three blanks to convert an Int to String, then to Double, and finally to Int again.

Swift

let number = 100
let text = [1](number)
if let doubleValue = [2](text) {
    let finalInt = [3](doubleValue)
}

Drag options to blanks, or click blank then click option'

AString

BDouble

CInt

DFloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using Float instead of Double for conversion.

Skipping the optional binding for Double conversion.

Trying to convert String directly to Int without Double.

Convert Int to String with String(number), then String to Double with Double(text), and finally Double to Int with Int(doubleValue).