[Solved] Which of the following is a correct Kotlin syntax feature that improves safety compared to Java? — Ans: Using val name: String? to declare a nullable variable | Kotlin

Kotlin - Basics and JVM Runtime

Which of the following is a correct Kotlin syntax feature that improves safety compared to Java?

AUsing <code>var x: Int = null</code> to allow null values

BDeclaring variables without specifying type always

CUsing <code>val name: String?</code> to declare a nullable variable

DUsing <code>void</code> as a return type

Step-by-Step Solution

Solution:

Step 1: Identify Kotlin's null safety syntax
Kotlin uses ? after a type to mark it nullable, e.g., String?.
Step 2: Check other options for correctness
Using var x: Int = null to allow null values is wrong because Int cannot be assigned null without ?. Declaring variables without specifying type always is incorrect because Kotlin requires type inference or explicit types. Using void as a return type is Java syntax, not Kotlin.
Final Answer:
Using val name: String? to declare a nullable variable -> Option C
Quick Check:
Nullable types use ? in Kotlin [OK]

Quick Trick: Nullable types end with ? in Kotlin [OK]

Common Mistakes:

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Which of the following is a correct Kotlin syntax feature that improves safety compared to Java?