Main entry point and @main attribute in Swift - Mini Project: Build & Apply

Main Entry Point and @main Attribute in Swift

📖 Scenario: Imagine you want to create a simple Swift program that prints a welcome message. To run this program, you need a main entry point where the program starts. Swift uses the @main attribute to mark this starting point.

🎯 Goal: You will build a Swift program with a main entry point using the @main attribute. Your program will print a welcome message to the screen.

📋 What You'll Learn

Create a struct named WelcomeApp

Add the @main attribute to WelcomeApp

Inside WelcomeApp, write a static main() method

In the main() method, print the exact message: "Welcome to Swift programming!"

💡 Why This Matters

🌍 Real World

Every Swift program needs a starting point. Using <code>@main</code> helps the computer know where to begin running your code.

💼 Career

Understanding the main entry point is essential for Swift developers to build apps and command-line tools that run correctly.

1

Create a struct named WelcomeApp

Write a struct called WelcomeApp to hold your program's main code.

Swift

struct WelcomeApp {
    // Your code here
}

Need a hint?

A struct is like a container for your program's code. Use the keyword struct followed by the name WelcomeApp.

2

Add the @main attribute to WelcomeApp

Add the @main attribute above the WelcomeApp struct to mark it as the program's entry point.

Swift

@main
struct WelcomeApp {
    // Your code here
}

Need a hint?

The @main attribute tells Swift where the program should start running.

3

Write a static main() method inside WelcomeApp

Inside WelcomeApp, write a static method named main() that will run when the program starts.

Swift

@main
struct WelcomeApp {
    static func main() {
        // Your code here
    }
}

Need a hint?

The main() method is where your program begins. Use static func main() inside the struct.

4

Print the welcome message inside the main() method

Inside the main() method, write print("Welcome to Swift programming!") to display the welcome message.

Swift

@main
struct WelcomeApp {
    static func main() {
        // Your code here
    }
}

Need a hint?

Use the print function to show text on the screen exactly as shown.