[Solved] What is the output of this Kotlin code? fun test(x: Any) { if (x is String) println("String: $x") else println("Not a String") } test(123) | Kotlin

Kotlin - Variables and Type System

What is the output of this Kotlin code?

fun test(x: Any) {
    if (x is String) println("String: $x")
    else println("Not a String")
}
test(123)

AString: 123

BNot a String

CCompilation error

DRuntime exception

Step-by-Step Solution

Solution:

Step 1: Analyze the input and type check
The function receives 123, which is an Int, not a String.
Step 2: Determine which branch runs
Since 123 is not a String, the else branch runs, printing "Not a String".
Final Answer:
Not a String -> Option B
Quick Check:
Type check false leads to else = A [OK]

Quick Trick: If is fails, else branch runs [OK]

Common Mistakes:

MISTAKES

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