英文:
How to change when packages are excecuted
问题
我有一个Go语言的包A，看起来像这样：
package A
var Something int
func Do_something() {
Something = 100
}
在包A中的do_something函数被main.go中调用：
package main
import "example.com/this_project/A"
func main() {
A.Do_something()
}
这个工作得很好，但现在我添加了包B。
package B
import (
"example.com/this_project/A"
"fmt"
"strconv"
)
_ = do_something_else()
func do_something_else() {
fmt.Println("%s is the value of something", strconv.Itoa(A.Something))
}
func Some_other_function() {
do_whatever()
}
Some_other_function也会在main.go中被调用：
package main
import (
"example.com/this_project/A"
"example.com/this_project/B"
)
func main() {
A.Do_something()
B.Some_other_function()
}
当我运行这个程序时，我期望它输出：
100
但实际上，它输出：
0
我认为这意味着包B在main.go之前运行，所以我尝试使用time.sleep，但它只会导致整个项目停止。任何建议将不胜感激。
英文:
I have a package A in Go that looks like
package A
var Something int
func Do_something() {
Something = 100
}
where do_something in package A is called in main.go
package main
import "example.com/this_project/A"
func main() {
A.Do_something()
}
That works well, but now I add package B.
package B
import (
"example.com/this_project/A"
"fmt"
"strconv"
)
_ = do_something_else()
func do_something_else() {
fmt.Println("%s is the value of something", strconv.Itoa(A.Something))
}
func Some_other_function() {
do_whatever()
}
Some_other_function will also get called in main.go
package main
import "example.com/this_project/A"
import "example.com/this_project/B"
func main() {
A.Do_something()
B.Some_other_function()
}
When I run this program, I expect it to output
100
But instead, it outputs
0
I think this means that package B is running before main.go, so I tried using time.sleep, but it just caused the entire project to stop. Any suggestions will be appreciated.
答案1
得分: 3
所有全局变量在main开始运行之前都会被初始化。因此，这行代码：
_ = do_something_else()
会在main开始之前运行，这将打印变量的当前值，此时为0。
英文:
All global variables are initialized before main starts running. Because of that, this line:
_ = do_something_else()
will run before main starts, which will print the current value of the variable, which is 0 at that point.
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