GO Tutorial

MAIN() FUNCTION IN GO

🚀 Understanding the `main()` Function in Go

Every Go program must have a main package, and inside it, a main() function. This is where your program starts executing—just like the engine that starts a car 🚗.

🔑 Note: Without the main() function, your Go application won't run.

💻 1. Basic Structure of main()

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

Explanation:

package main: tells Go this is a standalone program.
import "fmt": imports the fmt package to use print functions.
func main(): the entry point of the program.

📥 2. Output of main()

Hello, World!

⚠️ Warning: If you remove main() from the main package, Go will throw an error:

go: cannot find main module; see 'go help modules'

🧠 3. Can You Have Multiple main() Functions?

No. You can have only one main() in your main package. If you have more than one, the program won't compile.

🧪 4. Let's Add Some Logic Inside main()

package main

import "fmt"

func main() {
    var name string = "Technorank"
    fmt.Println("Welcome to Go, " + name + "!")
}

Output:

Welcome to Go, Technorank!

💡 Try It Yourself!

You can test the main() function live on:

🔗 Go Playground

✅ Summary:

main() is the starting point of every Go program
Only one main() function is allowed in the main package
Code execution begins inside this function

🌟 Enjoyed Learning with Us?

Help others discover Technorank Learning by sharing your honest experience.
Your support inspires us to keep building!

Leave a Google Review

Topics