Main entry point and @main attribute in Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main entry point of a Swift program using the @main attribute.

Swift

@[1]
struct MyApp {
    static func main() {
        print("Hello, Swift!")
    }
}

Drag options to blanks, or click blank then click option'

Astart

Bmain

Centry

Dlaunch

Attempts:

3 left

💡 Hint

Common Mistakes

Using @start or @entry instead of @main.

Forgetting the @ symbol before main.

The @main attribute tells Swift where the program starts. You must use @main to mark the main entry point.

2fill in blank

medium

Complete the code to define the main function inside a struct marked with @main.

Swift

@main
struct App {
    static func [1]() {
        print("App started")
    }
}

Drag options to blanks, or click blank then click option'

Astart

Blaunch

Crun

Dmain

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the function 'start' or 'run' instead of 'main'.

Making the function non-static.

The main function must be named 'main' to be recognized as the program's entry point.

3fill in blank

hard

Fix the error in the code by completing the missing attribute to mark the main entry point.

Swift

[1]
struct Program {
    static func main() {
        print("Running program")
    }
}

Drag options to blanks, or click blank then click option'

A@main

B@launch

C@entry

D@start

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect attributes like @start or @entry.

Not marking the struct at all.

You must mark the struct with @main to tell Swift this is the program's entry point.

4fill in blank

hard

Fill both blanks to create a Swift program with a main entry point that prints a message.

Swift

@[1]
struct [2] {
    static func main() {
        print("Welcome!")
    }
}

Drag options to blanks, or click blank then click option'

Amain

Bstart

CMyApp

DProgram

Attempts:

3 left

💡 Hint

Common Mistakes

Using @start instead of @main.

Using invalid struct names.

Use @main to mark the struct, and the struct name can be any valid identifier like MyApp.

5fill in blank

hard

Fill all three blanks to define a Swift program with a main entry point that prints a custom message.

Swift

@[1]
struct [2] {
    static func [3]() {
        print("Hello from Swift!")
    }
}

Drag options to blanks, or click blank then click option'

Amain

Bstart

DApp

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong attribute names.

Naming the function something other than 'main'.

Using invalid struct names.

The attribute is '@main', the struct name can be 'App', and the function must be named 'main'.