golang 变量声明

发布时间：2020-12-16 09:45:54 所属栏目：大数据来源：网络整理

导读：In Go, variables are explicitly declared and used by the compiler to e.g. check type-correctness of function calls. package main import "fmt" func main () { var declares 1 or more variables. var a string = "initial" fmt . Println ( a ) You

In Go,variablesare explicitly declared and used by the compiler to e.g. check type-correctness of function calls.
	package main
	import "fmt"
	func main() {
`var`declares 1 or more variables.	var a string = "initial" fmt.Println(a)
You can declare multiple variables at once.	var b, c int = 1, 2 fmt.Println(b, c)
Go will infer the type of initialized variables.	var d = true fmt.Println(d)
Variables declared without a corresponding initialization arezero-valued. For example,the zero value for an`int`is`0`.	var e int fmt.Println(e)
The`:=`syntax is shorthand for declaring and initializing a variable,e.g. for`var f string = "short"`in this case.	f := "short" fmt.Println(f) }

$ go run variables.go initial 1 2 true 0 short

In Go,top-level variable assignmentsmustbe prefixed with thevarkeyword. Omitting thevarkeyword is only allowed within blocks.

package main

var toplevel = "Hello world"         // var keyword is required

func F() {
        withinBlock := "Hello world" // var keyword is not required
}

（编辑：李大同）

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