Go中的覆盖范围[重复]

Question

This question already has an answer here:

• Refer to constant or package level variable instead of function level variable 1 answer

I'm actually new to go and I'm unable to find how to override scope of the variable in Go

consider this...

package main

import (
    "fmt"
)

var x = 10
var a int = 10

func main() {
    var a int = 20
    fmt.Println(a)
}

When I run it the output is 20 which means it actually prints the local scope variable

How can I display the global variable 'a' inside the main function

</div>

Answer 1

What you're doing is called "variable shadowing". If you want to access the global variable, the only option is simply to not shadow it!

var a int = 10

func main() {
    var localA int = 20
    fmt.Println(a) // 10
    fmt.Println(localA) // 20
}

Of course, you could preserve the global value in a different local variable before shadowing. I can't imagine when this would actually be useful:

var a int = 10

func main() {
    globalA := a
    var a int = 20
    fmt.Println(a) // 20
    fmt.Println(globalA) // 10
}