What is Kotlin - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print a greeting in Kotlin.

Kotlin

fun main() {
    println([1])
}

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

A"Hello, Kotlin!"

BHello, Kotlin!

Cprint("Hello, Kotlin!")

Decho "Hello, Kotlin!"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the quotes around the text.

Using print instead of println without parentheses.

In Kotlin, println prints text to the screen. The text must be inside quotes.

2fill in blank

medium

Complete the code to declare a variable holding the number 10.

Kotlin

fun main() {
    val number: Int = [1]
    println(number)
}

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

A10

BNumber

Cten

D"10"

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the number inside quotes, making it a string.

Using a word instead of a number.

In Kotlin, numbers are written without quotes. Quotes make them text.

3fill in blank

hard

Fix the error in the function declaration by completing the blank.

Kotlin

fun greet() : [1] {
    return "Hello"
}

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

AInt

BString

CUnit

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using Unit or void which mean no return value.

Using Int which is for numbers.

The function returns a text string, so its return type must be String.

4fill in blank

hard

Fill both blanks to create a list of numbers from 1 to 5.

Kotlin

fun main() {
    val numbers = listOf([1], [2], 3, 4, 5)
    println(numbers)
}

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

A1

B2

C"1"

D"2"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers, making them strings.

Using wrong numbers or text.

The list holds numbers, so use numbers without quotes.

5fill in blank

hard

Fill all three blanks to create a function that adds two numbers and returns the result.

Kotlin

fun add([1]: Int, [2]: Int) : [3] {
    return a + b
}

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

Aa

Bb

CInt

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong parameter names that don't match the return statement.

Using String as return type instead of Int.

The function parameters are two integers named a and b, and it returns an integer.