You want to create a Swift program that prints "Welcome!" only if a condition is true at startup. Using @main, which is the best way to implement this?

hard📝 Application Q15 of 15

Swift - Basics and Runtime

You want to create a Swift program that prints "Welcome!" only if a condition is true at startup. Using @main, which is the best way to implement this?

Astruct App { static func main() { if true { print("Welcome!") } } }

B@main struct App { func main() { if true { print("Welcome!") } } }

C@main struct App { static func main() { if true { print("Welcome!") } } }

D@main func main() { if true { print("Welcome!") } }

Step-by-Step Solution

Solution:

Step 1: Use @main on a type with static main()
The program must have a type marked with @main and a static main() method to run at startup.
Step 2: Implement conditional print inside static main()
Inside main(), use the if statement to print "Welcome!" only if the condition is true.
Final Answer:
@main struct App { static func main() { if true { print("Welcome!") } } } -> Option C
Quick Check:
@main type + static main() + condition inside main() [OK]

Quick Trick: Always put @main on type with static main() method [OK]

Common Mistakes:

Making main() an instance method
Forgetting @main attribute on the type
Trying to put @main on a function

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You want to create a Swift program that prints "Welcome!" only if a condition is true at startup. Using @main, which is the best way to implement this?

Step 1: Use @main on a type with static main()

Step 2: Implement conditional print inside static main()

Final Answer:

Quick Check:

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