Kotlin Variables and Data Types

Kotlin Variables and Data Types - Important Points

11.		Which of the following is a valid Kotlin variable declaration for a nullable String?

A. var name: String = null

B. var name: String? = null

C. var name = null

D. var name: Nullable = null

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Answer: option b

Explanation:

To declare a nullable variable in Kotlin, you can add a "?" after the data type. Option B is a valid variable declaration for a nullable String.

12.		What is the output of the following Kotlin code? fun main() { val a = 5 val b = 2 val result = a / b println(result) }

12.

What is the output of the following Kotlin code?

fun main() {
val a = 5
val b = 2
val result = a / b
println(result)
}

A. 2.5

B. 2

C. 2

D. 2.5f

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Answer: option b

Explanation:

The "/" operator performs integer division when used with two integers. So, the output of the code snippet is 2.

13.		What is the output of the following Kotlin code? fun main() { val a = 5 val b = 2 val result = a.toDouble() / b println(result) }

13.

What is the output of the following Kotlin code?

fun main() {
val a = 5
val b = 2
val result = a.toDouble() / b
println(result)
}

A. 2.5

B. 2

C. 2

D. 2.5f

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Answer: option a

Explanation:

The "toDouble()" function converts the integer value of "a" to a double value before performing division. So, the output of the code snippet is 2.5.

14.		Which of the following is a valid Kotlin variable declaration for a list of strings?

A. val names: ArrayList = ["John", "Jane"]

B. val names = ["John", "Jane"]

C. val names: List = listOf("John", "Jane")

D. val names = arrayListOf("John", "Jane")

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Answer: option c

Explanation:

In Kotlin, you can declare a list using the "listOf()" function. Option C is a valid variable declaration for a list of strings named "names".

15.		What is the output of the following Kotlin code? fun main() { val x = 5 val y = "10" val result = x + y.toInt() println(result) }

15.

What is the output of the following Kotlin code?

fun main() {
val x = 5
val y = "10"
val result = x + y.toInt()
println(result)
}

A. 510

B. 15

C. 510

D. 15

View Answer Discuss Work Space

Answer: option b

Explanation:

The "toInt()" function converts the string value of "y" to an integer before performing addition. So,

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