How golang code runs

Golang is a compiled language, and its code needs to be compiled into an executable file before it can be run. However, unlike other compiled languages, Golang has the ability to compile on multiple platforms, making it one of the preferred languages ​​for many developers. In this article, we will take an in-depth look at how Golang code runs, including the steps to write, build, and run Golang code.

1. Writing Golang Code

Before you start writing Golang code, you need to install the Golang programming environment on your computer. Once installed, you can use a text editor or integrated development environment (IDE) to write Golang code. Here, we use Visual Studio Code as an example to show the steps of writing Golang code.

First, open Visual Studio Code and create a new Golang project. Enter the following command in the terminal:

mkdir MyGolangProject
cd MyGolangProject

Then, open your project folder in Visual Studio Code. In the left sidebar, click the "New File" button and save it as hello.go. In this file, we will write a very simple program that prints "Hello, World!". Next, enter the following code:

package main

import "fmt"

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

Code explanation:

• Line 1: package main defines the package to which this file belongs. In the Go language, each file must belong to a certain package, and files whose package names are not main cannot be compiled into executable files.
• Line 3: import "fmt" imports the "fmt" package in the Golang standard library. This package provides formatting, input and output and other functions. We can use it to output "Hello, World!" .
• Lines 5-7: A function named main is defined as the entry point of the program.
• Line 6: Use the fmt.Println method to output the string "Hello, World!".

2. Building Golang code

After writing the Golang code, we need to use a compiler to compile it into an executable file. The compiler that comes with Golang is the go command, and you can build an executable file by running this command in the terminal. In this example, we will use the following command to build the hello.go file:

go build hello.go

After executing this command, an executable file named "hello" will be generated in the same directory. If you are using a Windows operating system, the executable file extension is ".exe".

3. Run Golang code

After building the executable file, we can run it directly on the terminal. In this example, we can run the executable file by entering the following command in the terminal:

./hello

After executing this command, the console will output the "Hello, World!" we defined in the hello.go file. "information.

In addition to executable files, we can also use the go command to run Golang code. Enter the following command on the command line to run the hello.go file:

go run hello.go

After executing this command, you will see the "Hello, World!" string output on the terminal.

Summary

Golang is a very popular programming language. It has the advantages of cross-platform, efficiency, simplicity, etc., so it is favored by many developers. This article introduces the process of writing, building and running Golang code, hoping to help you better understand how to use Golang. You can use these tips to more easily build efficient Golang applications during future development.

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