{"id":13,"date":"2024-08-30T13:17:58","date_gmt":"2024-08-30T06:17:58","guid":{"rendered":"https:\/\/gotutorial.org\/?page_id=13"},"modified":"2024-09-22T14:35:41","modified_gmt":"2024-09-22T07:35:41","slug":"go-hello-world","status":"publish","type":"page","link":"https:\/\/www.gotutorial.org\/go-tutorial\/go-hello-world\/","title":{"rendered":"Go Hello World"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you will learn how to develop the Go Hello World program.<\/p>\n\n\n\n

Creating a project<\/h2>\n\n\n\n

First, create a new directory to store the Go source code files.<\/p>\n\n\n

mkdir hello-world<\/code><\/span><\/pre>\n\n\n
Second, navigate to the project directory:<\/p>\n\n\n
cd hello-world<\/code><\/span><\/pre>\n\n\n
Defining the Go Hello World Program<\/h2>\n\n\n\n
Create a new file called main.go<\/code> within the hello-world<\/code> directory with the following code:<\/p>\n\n\n
package<\/span> main\n\nimport<\/span> \"fmt\"<\/span>\n\nfunc<\/span> main<\/span>()<\/span><\/span>  {\n    fmt.Println(\"Hello, World!\"<\/span>)\n}\n<\/code><\/span>Code language:<\/span> Go<\/span> (<\/span>go<\/span>)<\/span><\/small><\/pre>\n\n\n
How it works.<\/p>\n\n\n\n
First, define the main<\/code> package:<\/p>\n\n\n
package<\/span> main<\/code><\/span>Code language:<\/span> Go<\/span> (<\/span>go<\/span>)<\/span><\/small><\/pre>\n\n\n
Go uses packages to organize code. Each package may contain one or more source code files. In this example, we define a package called main<\/code>, which is a special package in Go.<\/p>\n\n\n\n
When you run a Go program, the Go runtime looks for the main<\/code> package first. Therefore, every Go application must have the main<\/code> package.<\/p>\n\n\n\n
The Go runtime is responsible for installing your program code and dependencies and executing the program in the target environment.<\/p>\n\n\n\n
Second, import the standard library fmt<\/code> which includes many useful functions for formatting text and displaying text to the console:<\/p>\n\n\n
import<\/span> \"fmt\"<\/span><\/code><\/span>Code language:<\/span> Golo<\/span> (<\/span>golo<\/span>)<\/span><\/small><\/pre>\n\n\n
Third, declare the main<\/code> function:<\/p>\n\n\n
func<\/span> main<\/span>()<\/span><\/span> {\n    fmt.Println(\"Hello, World!\"<\/span>)\n}<\/code><\/span>Code language:<\/span> Go<\/span> (<\/span>go<\/span>)<\/span><\/small><\/pre>\n\n\n
In Go, a function is a reusable block of code<\/a>. To define a function, you use the func<\/code> keyword. In this example, we define the main<\/code> function.<\/p>\n\n\n\n
The main()<\/code> is a special function, which serves as the entry point for every Go program. When you run a Go program, the Go runtime executes the main()<\/code> function in the main<\/code> package first. Therefore, a Go program must have the main<\/code> package and main()<\/code> function.<\/p>\n\n\n\n
The parentheses after the main<\/code> function name ()<\/code> indicate that the main()<\/code> function does not take any arguments. <\/p>\n\n\n\n
The opening and closing curly braces ({}<\/code>) indicate the beginning and ending of a function.<\/p>\n\n\n\n
Inside the main()<\/code> function, we call the Println()<\/code> function of the fmt<\/code> package to display the message \"Hello, World!\"<\/code> to the console:<\/p>\n\n\n
fmt.Println(\"Hello, World!\"<\/span>)<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
Running the Go Hello World program<\/h2>\n\n\n\n
Open your terminal and navigate to the project directory:<\/p>\n\n\n
cd hello-world<\/code><\/span>Code language:<\/span> plaintext<\/span> (<\/span>plaintext<\/span>)<\/span><\/small><\/pre>\n\n\n
Compile, build, and run the Go program:<\/p>\n\n\n
go run main.go<\/code><\/span>Code language:<\/span> plaintext<\/span> (<\/span>plaintext<\/span>)<\/span><\/small><\/pre>\n\n\n
It\u2019ll return the following output on the console:<\/p>\n\n\n
Hello, World!<\/code><\/span>Code language:<\/span> plaintext<\/span> (<\/span>plaintext<\/span>)<\/span><\/small><\/pre>\n\n\n
Summary<\/h2>\n\n\n\n
    \n
  • Go uses packages to organize code.<\/li>\n\n\n\n
  • Use import<\/code> to include other packages.<\/li>\n\n\n\n
  • Use the func<\/code> keyword to define a function.<\/li>\n\n\n\n
  • Every Go program must have a main<\/code> package that contains a main()<\/code> function. The main()<\/code> function serves as an entry point for every Go program.<\/li>\n\n\n\n
  • Use the go run command to compile, build, and run a Go program.<\/li>\n<\/ul>\n
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