Kotlin Kotlin Basics and Syntax 3

Question 1

What is the Elvis operator in Kotlin?

Accepted Answer

?:

Answer

The Elvis operator `?:` returns the left-hand expression if non-null, otherwise returns the right-hand expression.

Question 2

How do you declare a multiline string in Kotlin?

Accepted Answer

Using triple quotes """..."""

Answer

Kotlin uses triple-quoted strings (`"""..."""`) to create raw multiline strings without escape sequences.

Question 3

Which function is used to convert a String to an Int in Kotlin?

Accepted Answer

toInt()

Answer

Kotlin's `String.toInt()` extension function converts a string to an `Int`, throwing `NumberFormatException` if invalid.

Question 4

What is the default visibility modifier in Kotlin?

Accepted Answer

public

Answer

In Kotlin, declarations are `public` by default, meaning they are visible everywhere.

Question 5

Which statement about Kotlin's `when` expression is correct?

Accepted Answer

It can be used as both a statement and an expression

Answer

`when` in Kotlin is flexible — it can act as a statement or return a value as an expression, and `else` is only required when used as an expression.

Kotlin Practice Test