Var for mutable references in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a mutable variable named count initialized to 10.

Kotlin

var count: Int = [1]

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

Avar

Bval

C10

D"10"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around 10, which makes it a string instead of an integer.

Using val instead of var for mutable variables.

The keyword var declares a mutable variable, and count is initialized to the integer 10.

2fill in blank

medium

Complete the code to change the value of the mutable variable score to 42.

Kotlin

score [1] 42

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

A->

B=

C==

D:

Attempts:

3 left

💡 Hint

Common Mistakes

Using == instead of = for assignment.

Using arrow -> or colon : which are not assignment operators.

The single equals sign = is used to assign a new value to a variable.

3fill in blank

hard

Fix the error in the code by choosing the correct keyword to declare a mutable variable.

Kotlin

[1] name: String = "Alice"

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

Avar

Bconst

Cval

Dlet

Attempts:

3 left

💡 Hint

Common Mistakes

Using val when the variable needs to be mutable.

Using const or let which are not Kotlin keywords for variable declaration.

The keyword var declares a mutable variable in Kotlin. val declares an immutable variable.

4fill in blank

hard

Fill both blanks to declare a mutable variable temperature of type Double initialized to 36.6.

Kotlin

[1] temperature: [2] = 36.6

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

Avar

Bval

CDouble

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using val instead of var for mutability.

Using Int type for a decimal number.

Use var to declare a mutable variable and Double as the type for decimal numbers.

5fill in blank

hard

Fill all three blanks to declare a mutable variable message of type String and assign it the value "Hello".

Kotlin

[1] message: [2] [3] "Hello"

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

Avar

BString

C=

Dval

Attempts:

3 left

💡 Hint

Common Mistakes

Using val instead of var for mutability.

Forgetting the assignment operator =.

Using wrong type or missing the type declaration.

Use var for a mutable variable, String as the type, and = to assign the value.