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A comprehensive guide to predefined identifiers in Go

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Apr 07, 2024 pm 06:09 PM

gogo languagepredefined identifier

Go语言预定义标识符包括类型标识符（如int、float32）、常量标识符（如const、iota）、变量标识符（如var、:=），可用于定义类型、常量和变量。这些标识符有助于编写简洁、清晰的代码，例如定义类型（type）、常量（const）和变量（var）。

A comprehensive guide to predefined identifiers in Go

A comprehensive guide to predefined identifiers in Go

Go 语言提供了一系列预定义标识符，用于定义类型、常量和变量。这些标识符非常强大，可以帮助我们编写更简洁、更清晰的代码。

类型标识符

bool：布尔类型
int：整数类型
int8、int16、int32、int64：不同位宽的整数类型
uint、uint8、uint16、uint32、uint64：无符号整数类型
float32、float64：浮点数类型
complex64、complex128：复数类型
string：字符串类型
byte：字节类型（等同于 uint8）
rune：Unicode 字符类型（等同于 int32）

常量标识符

const：定义常量
iota：连续整数生成器

变量标识符

var：定义变量
:=：定义并初始化变量

实战案例

// 定义类型
type Person struct {
    Name string
    Age int
}

// 定义常量
const Pi float64 = 3.14159265358979323846
const WeeksPerYear = 52

// 定义变量
var (
    name string = "John Doe"
    age int = 30
)

通过这些预定义标识符，我们可以创建各种数据结构和函数，以构建强大的Go应用程序。

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