Go language introduction, environment installation, basic structure

1.Hello Go!

Go Is an open source programming language , It makes construction simple 、 Reliable and efficient software becomes easy .
Go It's from 2007 Year end by Robert Griesemer, Rob Pike, Ken Thompson Host development , Later I joined in Ian Lance Taylor, Russ Cox wait forsomeone , And finally 2009 year 11 In open source , stay 2012 Released earlier this year Go 1 Stable version . Now? Go The development of is completely open , And have an active community .
Go Language features

• concise 、 Fast 、 Security

• parallel 、 Interesting 、 Open source

• memory management 、 Array security 、 Compile quickly Go The language is designed as an application for carrying Web The server , System programming language for storage cluster or similar giant central server .
  For the field of high-performance distributed systems ,Go Language is undoubtedly more efficient than most other languages . It provides massive parallel support , This is no better for the development of the game server .

2. Environmental installation

Go Download address

Check ：

C:\Users\dahez>go versiongo version go1.18.1 windows/amd64

GoLand Download address
To configure Go Path
1. Create a new one Gopath Catalog

2. Add to system variable ：

3.Goland,File—Setting

4. To configure Goroot:

5. To configure Gopath:

Check here ~

Be accomplished ！

3.Go Language structure

Go The basic components of language are as follows ：

• Package declaration

• Introduction package

• function

• Variable

• sentence & expression

• notes Now let's look at the simple code , The code is output "Hello World!":

package mainimport "fmt"func main() {   /*  This is my first simple program  */   fmt.Println("Hello, World!")}

Let's take a look at the various parts of the above program ：

1. First line of code package main The package name is defined . You have to indicate in the first line of the source file which package this file belongs to , Every Go The application contains a file named main My bag .

2. The next line import "fmt" tell Go Compiler this program needs to use fmt package （ Function of , Or other elements ）, fmt Package implements formatting IO（ Input / Output ） Function of .

3. The next line func main() Is the function that the program starts to execute .main Function is a necessary part of every executable program , Generally speaking, it is the first function executed after startup

4. The next line /\*...\*/ It's a comment , Will be ignored during program execution .

5. The next line fmt.Println(...) You can output strings to the console , And at the end automatically add the line feed character \n It should be noted that { You can't put it on a single line , So the following code will generate errors at run time ：

package mainimport "fmt"func main()  {  //  error ,{  Not on a single line     fmt.Println("Hello, World!")}

4.Go Compilation execution of

Enter the command go run hello.go And press enter to execute the code

$ go run hello.goHello, World!

We can also use go build Command to generate binary files

$ go build hello.go $ lshello    hello.go$ ./hello Hello, World!

Copyright notice ： This tutorial is based on the rookie tutorial
author ： The end of the world and you

Game programming ️, A game development favorite ~

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