Let's discuss the Go Program structure using the hello world program. Go program has the same structure as other programming languages,

• define the package name
• import require packages
• define global variable/constant (optional)
• define functions

Hello World Program

The main() function is the program execution entry point for the Go program.

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

Let's create a new file, copy the below code snippet and save it as main.go.

• The very first line of the program declares the main package. A package is a way to group functions. Unlike Java, a package name must define on the first line of the file. All the files in the same directory belong to the same package.
• Followed by you need to import the required packages. Here, we have imported the popular fmt package, which contains functions for formatting text, including printing on the console. This package is one of the standard library packages you got when you installed Go.
• Then you have implemented the main() function to print a message to the console. The main() function executes by default when you run the main package.

Note:

• In the Go program, we don't need to use enclosing semi-comma.

Execute Go Program

To execute the above code, you should run the command go run main.go on the terminal or CMD. It will run the main() function and print the below output on the console.

$ go run main.go
Hello, World