Kotlin - Basics and JVM Runtime
Why does Kotlin's main function usually have a return type of Unit instead of Int like in some other languages?
Why does Kotlin's main function usually have a return type of Unit instead of Int like in some other languages?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Kotlin main function return type
Kotlin's main returns Unit, meaning no value, unlike C/C++ where main returns Int exit code.Step 2: Reason why Kotlin uses Unit
Kotlin programs do not return exit codes by default; the OS assumes success unless exceptions occur.Final Answer:
Because Kotlin programs do not return exit codes by default. -> Option CQuick Check:
Main return type Unit means no exit code [OK]
Quick Trick: Kotlin main returns Unit; exit codes not returned by default [OK]
Common Mistakes:
MISTAKES- Thinking Kotlin disallows return values
- Assuming all languages require void main
- Believing exceptions replace all returns
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