A comprehensive guide to predefined identifiers in Go
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
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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