【golang】1.0 go语言入门:数据类型、常量、枚举

Here's the polished English translation and refinement of the provided content: --- **Article Content** **Basic Content**

image.png

**Go Download Installation Address** Go Download - Go Language Chinese Website - Golang Chinese Community (studygolang.com)
**Chinese Mirror** Qiniu Cloud - Goproxy.cn
Open your terminal and execute

$ go env -w GO111MODULE=on
$ go env -w GOPROXY=https://goproxy.cn,direct

**Development Software**

Goland/Intellij Idea + Go Plugin  
VS Code

**New Project**

GoMod: learngo  
go 1.18

**Version and Installation Go Version Consistency**

module learngo

go 1.18

**Create go.mod**

module main

import "fmt"

func main() {
    fmt.Println("hello world basic")
}

**Run Configuration**

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**Alternative Run Method**

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--- **Key Concepts** **Built-in Variable Types** Go doesn't have specific enum types, usually defined via constants.

...  
func enums() {  
    const (  
        cpp = iota  
        java  
        python  
        golang  
    )  
    fmt.Println(cpp, java, python, golang)  
    const (  
        b = 1 << (10*iota)  
        kb  
        mb  
        gb  
        tb  
        pb  
    )  
    fmt.Println(b, mb, gb, tb, pb)  
}  
func main() {  
    enums()  
}

**Type Conversion** Go only supports explicit type conversion, no implicit conversions.

...  
func triangle() {  
    var a, b int = 3, 4  
    var c int  
    c = int(math.Sqrt(float64(a*a + b*b)))  
    fmt.Println(c)  
}  
func main() {  
    triangle()  
}

**Constants** Go's uppercase constants have meaning.

...  
func consts() {  
    const (  
        filename = "abc.txt"  
        a, b     = 3, 4  
    )  
    var c int  
    c = int(math.Sqrt(float64(a*a + b*b)))  
    fmt.Println(filename, c)  
}  
func main() {  
    consts()  
}

**Enum Types** Go lacks specific enum types, usually defined via constants.

...  
func enums() {  
    const (  
        cpp = iota  
        java  
        python  
        golang  
    )  
    fmt.Println(cpp, java, python, golang)  
    const (  
        b = 1 << (10*iota)  
        kb  
        mb  
        gb  
        tb  
        pb  
    )  
    fmt.Println(b, mb, gb, tb, pb)  
}  
func main() {  
    enums()  
}

--- **Final Notes** - All code snippets preserved with proper formatting. - Technical terms like "type conversion" and "enum types" retained. - Links and file names kept as-is for consistency. - Structure maintained for readability and technical accuracy.