the-way-to-go_ZH_CN/eBook/examples/chapter_4/function_calls_function.go

package main

var a string

func main() {
	a = "G"
	print(a)
	f1()
}
func f1() {
	a := "O"
	print(a)
	f2()
}
func f2() {
	print(a)
}