You want to keep track of a user's score that changes during the game. Which Kotlin code correctly declares and updates this score using var?

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Kotlin - Variables and Type System

You want to keep track of a user's score that changes during the game. Which Kotlin code correctly declares and updates this score using var?

Avar score = 0 score = score + 10 println(score)

Bval score = 0 score = score + 10 println(score)

Cvar score: Int println(score)

Dval score: Int = 0 score += 10 println(score)

Step-by-Step Solution

Solution:

Step 1: Declare a mutable variable with initial value
Use var score = 0 to allow changes to score.
Step 2: Update the score correctly
Adding 10 to score with score = score + 10 works because score is mutable.
Final Answer:
var score = 0 score = score + 10 println(score) -> Option A
Quick Check:
Mutable var allows updating score [OK]

Quick Trick: Use var for values that change, val for constants [OK]

Common Mistakes:

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