Kotlin - Operators and Expressions
Which of the following is the correct way to negate a boolean variable
flag in Kotlin?Which of the following is the correct way to negate a boolean variable flag in Kotlin?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Recall the negation operator in Kotlin
The logical NOT operator is ! placed before the boolean variable.Step 2: Evaluate each option
val result = !flag uses !flag which is correct. val result = not flag uses 'not' keyword which is invalid syntax. val result = flag.not uses flag.not which is invalid (missing ()). val result = ~flag uses ~ which is bitwise NOT, invalid for booleans.Final Answer:
val result = !flag -> Option AQuick Check:
Negation operator = ! [OK]
Quick Trick: Use ! before variable to negate boolean [OK]
Common Mistakes:
MISTAKES- Using ~ instead of !
- Trying 'not' keyword
- Confusing method call with operator
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