Bird
0
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What will happen when you run this Kotlin code?

medium📝 Predict Output Q5 of 15
Kotlin - Variables and Type System
What will happen when you run this Kotlin code?
val message = "Hello"
message = "World"
println(message)
APrints: Hello
BPrints: World
CCompilation error: Val cannot be reassigned
DRuntime exception
Step-by-Step Solution
Solution:

  1. Step 1: Understand val reassignment

    Variables declared with val cannot be reassigned after initialization.

  2. Step 2: Reassignment attempt

    Trying to assign "World" to message causes a compilation error.

  3. Final Answer:

    The code will not compile and gives a compilation error -> Option C

  4. Quick Check:

    val variables are immutable references [OK]
Quick Trick: val variables cannot be reassigned [OK]
Common Mistakes:
MISTAKES
  • Assuming val variables can be reassigned
  • Expecting runtime error instead of compile error
  • Confusing val with var

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