[Solved] Identify the error in this Kotlin code snippet and fix it:val obj: Any = "Hello" val num: Int = obj as? Int println(num) | Kotlin

Kotlin - Null Safety

Identify the error in this Kotlin code snippet and fix it:

val obj: Any = "Hello"
val num: Int = obj as? Int
println(num)

AReplace <code>as?</code> with <code>as</code>

BChange <code>val num: Int</code> to <code>val num: Int?</code>

CCast <code>obj</code> to <code>String</code> instead of <code>Int</code>

DNo error, code runs fine

Step-by-Step Solution

Solution:

Step 1: Analyze variable types and cast
The safe cast obj as? Int returns null if cast fails, so the result is nullable Int?.
Step 2: Fix type mismatch
Declaring num as non-nullable Int causes a type mismatch error. Changing it to Int? fixes this.
Final Answer:
Change val num: Int to val num: Int? -> Option B
Quick Check:
Safe cast returns nullable type [OK]

Quick Trick: Safe cast result must be nullable type [OK]

Common Mistakes:

MISTAKES

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