Kotlin - Variables and Type System
Which of the following is a correct explicit type declaration for a mutable variable holding a decimal number in Kotlin?
Which of the following is a correct explicit type declaration for a mutable variable holding a decimal number in Kotlin?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify mutable variable syntax
Mutable variables usevar, so options withvalare immutable.Step 2: Check type and value compatibility
Price is a decimal, soDoubleis correct. var price: Double = 9.99 usesvar price: Double = 9.99, which is valid.Final Answer:
var price: Double = 9.99 -> Option CQuick Check:
Mutable decimal variable = var with Double type [OK]
Quick Trick: Use var for mutable, val for immutable variables [OK]
Common Mistakes:
MISTAKES- Using val when mutability is needed
- Assigning decimal to Int type
- Using string type for numbers
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