Kotlin Variables and Data Types

Kotlin Variables and Data Types - Important Points

16.		Which of the following is a valid way to declare a variable in Kotlin with a default value?

A. var count = 0

B. var count: Int

C. var count: Int = null

D. var count = null

View Answer Discuss Work Space

Answer: option a

Explanation:

Option A is a valid variable declaration with a default value of 0. In Kotlin, you can also declare variables with default values using the constructor of a class.

17.		Which of the following is a valid Kotlin variable declaration for a set of integers?

A. val numbers = hashSetOf(1, 2, 3)

B. val numbers: Set = [1, 2, 3]

C. val numbers: MutableSet = setOf(1, 2, 3)

D. val numbers: Set = setOf(1, 2, 3)

View Answer Discuss Work Space

Answer: option d

Explanation:

In Kotlin, you can declare a set using the "setOf()" function. Option D is a valid variable declaration for a set of integers named "numbers".

18.		Which of the following is a valid way to declare a variable in Kotlin with a constant value?

A. var PI: Float = 3.14f

B. val PI = 3.14f

C. const val PI = 3.14f

D. final val PI = 3.14f

View Answer Discuss Work Space

Answer: option c

Explanation:

In Kotlin, you can declare a variable with a constant value using the "const" keyworOption C is a valid way to declare a constant variable named "PI" with a value of 3.14f.

19.		Which of the following is a valid way to declare a variable in Kotlin with a lazy initialization?

A. val name by lazy = "John"

B. var name = lazy { "John" }

C. lateinit var name: String = "John"

D. val name: String? = null

View Answer Discuss Work Space

Answer: option a

Explanation:

In Kotlin, you can declare a variable with lazy initialization using the "lazy" keyworOption A is a valid way to declare a variable named "name" with lazy initialization and an initial value of "John".

20.		Which of the following is a valid way to declare a nullable variable in Kotlin?

A. var name: String = null

B. var name: String? = null

C. var name: Nullable = null

D. var name: NullableString = null

View Answer Discuss Work Space

Answer: option b

Explanation:

In Kotlin, you can declare a variable as nullable by appending a "?" to the type. Option B is a valid way to declare a nullable string variable named "name" with an initial value of null.

Worried about Placements?

Get on FAST TRACK COURSE

Kotlin Variables and Data Types

Subscribe for Latest Career Trends

Use AI and ChatGPT for Career Guidance

Unlock Your Future

Worried for Placements in 2024?

Join FAST TRACK Course

Supercharge Your SUCCESS

Join All in One Placement Mock Tests-2024