[Solved] Find the issue in this Swift code snippet:var score: Int! = 10 score = nil print(score + 5) — Ans: Runtime crash when adding to nil IUO | Swift

Swift - Optionals

Find the issue in this Swift code snippet:

var score: Int! = 10
score = nil
print(score + 5)

APrints Optional(15)

BRuntime crash when adding to nil IUO

CPrints 15 without error

DCompile error: cannot assign nil to IUO

Step-by-Step Solution

Solution:

Step 1: Analyze assignment of nil to IUO
Assigning nil to IUO is allowed but dangerous if accessed later.
Step 2: Accessing IUO after nil assignment
Adding 5 to score unwraps IUO which is nil, causing runtime crash.
Final Answer:
Runtime crash when adding to nil IUO -> Option B
Quick Check:
Using nil IUO in expression = crash [OK]

Quick Trick: IUO can be nil but accessing then crashes [OK]

Common Mistakes:

Master "Optionals" in Swift

9 interactive learning modes - each teaches the same concept differently

More Swift Quizzes

Find the issue in this Swift code snippet: