Type conversion is always explicit in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Kotlin

val number: Int = 10
val converted: Double = number.[1]()

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

AtoFloat

BtoString

CtoDouble

DtoInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using toInt() which does not change the type.

Using toString() which converts to text, not a number.

Using toFloat() which converts to Float, not Double.

In Kotlin, to convert an Int to a Double explicitly, you use the toDouble() function.

2fill in blank

medium

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

Kotlin

val decimal: Double = 9.99
val whole: Int = decimal.[1]()

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

AtoInt

BtoLong

CtoFloat

DtoDouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using toDouble() which keeps the type as Double.

Using toLong() which converts to Long, not Int.

Using toFloat() which converts to Float, not Int.

To convert a Double to an Int explicitly in Kotlin, use the toInt() function.

3fill in blank

hard

Fix the error in the code by explicitly converting the Int to a Double.

Kotlin

val a: Int = 5
val b: Double = a[1] 2.0

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

A+

B.toDouble() *

C/

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to multiply Int and Double directly without conversion.

Using only the '*' operator without conversion.

Using '+' operator which changes the operation.

You must convert 'a' to Double explicitly before multiplying by 2.0. So use 'a.toDouble() * 2.0'.

4fill in blank

hard

Fill both blanks to convert a String to Int and then add 10.

Kotlin

val input: String = "20"
val result: Int = input.[1]() [2] 10

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

AtoInt

B+

C-

DtoDouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using toDouble() instead of toInt() for conversion.

Using '-' instead of '+' for addition.

Trying to add 10 to a String without conversion.

First convert the String to Int using toInt(), then add 10 using '+'.

5fill in blank

hard

Fill all three blanks to convert a Double to Int, then to String, and concatenate " apples".

Kotlin

val price: Double = 5.99
val text: String = price.[1]().[2]() + [3]

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

AtoInt

BtoString

C" apples"

DtoDouble

Attempts:

3 left

💡 Hint

Common Mistakes

Skipping conversion steps and trying to add string to Double directly.

Using toDouble() instead of toInt() first.

Forgetting to convert Int to String before concatenation.

Convert Double to Int with toInt(), then Int to String with toString(), then add the text " apples".