Which of the following is the correct way to define the main entry point in Swift using the @main attribute?

easy📝 Syntax Q3 of 15

Swift - Basics and Runtime

Which of the following is the correct way to define the main entry point in Swift using the @main attribute?

A<pre>struct App { @main func main() { print("Hello") } }</pre>

B<pre>@main struct App { static func main() { print("Hello") } }</pre>

C<pre>@main func main() { print("Hello") }</pre>

D<pre>@main class App { func main() { print("Hello") } }</pre>

Step-by-Step Solution

Solution:

Step 1: Recognize valid @main usage
The @main attribute must be applied to a type (struct, class, or enum) that contains a static main() method.
Step 2: Analyze options
```
@main struct App { static func main() { print("Hello") } }
```
correctly applies @main to a struct with a static main() method.
Final Answer:
It designates the type as the program's starting point where execution begins. -> Option B
Quick Check:
@main on type with static main() method [OK]

Quick Trick: @main must be on a type with static main() [OK]

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