Syntax Quiz - Languages Kotlin

Free practice quiz: Syntax (Languages Kotlin). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. In Kotlin, what keyword is used to declare a variable that cannot be reassigned after its initial assignment?

   1. var
   2. val
   3. let
   4. const
   Show answer

   Answer: B. val

   In Kotlin, `val` is used to declare read-only variables (immutable), meaning they cannot be reassigned after their initial assignment. `var` is used for mutable variables.

2. What is the correct syntax for a multi-line comment in Kotlin?

   1. // comment // another comment
   2. /* comment another comment */
   3. -- comment -- another comment
   4. # comment # another comment
   Show answer

   Answer: B. /* comment another comment */

   Multi-line comments in Kotlin are enclosed within `/*` and `*/`.

3. What does the `val` keyword signify in Kotlin?

   1. A mutable variable
   2. A read-only (immutable) variable
   3. A constant that is evaluated at runtime
   4. A nullable variable
   Show answer

   Answer: B. A read-only (immutable) variable

   `val` declares a read-only property in Kotlin, which means it can be assigned a value only once.

4. How do you declare a default parameter value for a function in Kotlin?

   1. fun greet(name: String = "Guest")
   2. fun greet(name: String default "Guest")
   3. fun greet(name: String with default "Guest")
   4. fun greet(name: String := "Guest")
   Show answer

   Answer: A. fun greet(name: String = "Guest")

   Default parameter values are assigned using the `=` operator in the function signature.

5. Which of the following is the Kotlin syntax for a `for` loop iterating over a range of numbers from 1 to 5 (inclusive)?

   1. for (i in 1..5) { ... }
   2. for i in 1 to 5 { ... }
   3. for i from 1 to 5 { ... }
   4. loop i from 1 to 5 { ... }
   Show answer

   Answer: A. for (i in 1..5) { ... }

   Kotlin's `for` loop uses the `in` keyword and the range operator `..` for iterating over sequences, including number ranges.

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