[Solved] What is wrong with this Kotlin code?val message: String? = null println(message.length?.toString()) — Ans: You cannot access length directly on a nullable variable without safe call | Kotlin

Kotlin - Null Safety

What is wrong with this Kotlin code?

val message: String? = null
println(message.length?.toString())

AThere is no error in this code

BThe safe call operator is used incorrectly on <code>length</code>

CThe <code>toString()</code> method cannot be called on an Int

DYou cannot access <code>length</code> directly on a nullable variable without safe call

Step-by-Step Solution

Solution:

Step 1: Analyze variable type
message is nullable (String?).
Step 2: Check property access
Accessing length directly on a nullable variable without safe call is invalid.
Step 3: Identify error
The code should use message?.length to safely access length.
Final Answer:
You cannot access length directly on a nullable variable without safe call -> Option D
Quick Check:
Nullable variables require safe call for member access [OK]

Quick Trick: Nullable variables need ?. before member access [OK]

Common Mistakes:

MISTAKES

Master "Null Safety" in Kotlin

9 interactive learning modes - each teaches the same concept differently

More Kotlin Quizzes

What is wrong with this Kotlin code?