英文:
Unable to import a function from file in same directory
问题
我正在翻译你提供的内容，请稍等片刻。
英文:
I am following a tutorial and stuck on this. I also tried to go through official docs, but was unable to find out that's wrong.
Before posting here i found out that GOPATH also needs to be configured.
GOPATH: A:\GO
Path to utils folder: A:\GO\fem-intro-to-go\05_toolkit\code\utils
There are 2 files in utils, math.go and add_test.go.
math.go
package utils
import "fmt"
func printNum(num int) {
fmt.Println("Current Number:", num)
}
// Add adds together multiple numbers
func Add(nums ...int) int {
total := 0
for _, v := range nums {
printNum(v)
total += v
}
return total
}
add_test.go
package utils
import "testing"
func TestAdd(t *testing.T) {
expected := 4
actual := Add(2, 2)
if actual != expected {
t.Errorf("Add function does not add up: Expected: %d, Actual: %d", expected, actual)
}
}
VS code is giving an error in add_test.go: undeclared name: Add
Full Description of error:
{
"resource": "/a:/GO/fem-intro-to-go/05_toolkit/code/utils/add_test.go",
"owner": "_generated_diagnostic_collection_name_#1",
"code": {
"value": "UndeclaredName",
"target": {
"$mid": 1,
"external": "https://pkg.go.dev/golang.org/x/tools/internal/typesinternal?utm_source%3Dgopls#UndeclaredName",
"path": "/golang.org/x/tools/internal/typesinternal",
"scheme": "https",
"authority": "pkg.go.dev",
"query": "utm_source=gopls",
"fragment": "UndeclaredName"
}
},
"severity": 8,
"message": "undeclared name: Add",
"source": "compiler",
"startLineNumber": 9,
"startColumn": 12,
"endLineNumber": 9,
"endColumn": 15
}
答案1
得分: 1
使用go 1.16.6构建代码时，我没有看到任何问题。如果我开始一个新的go项目：
mkdir example
cd example
go mod init example
然后将你的代码放在utils/目录中，并将以下内容放在main.go中：
package main
import (
"example/utils"
"fmt"
)
func main() {
answer := utils.Add(1, 2, 3)
fmt.Printf("得到的答案：%d\n", answer)
}
这样我就有了以下布局：
$ tree .
.
├── example
├── go.mod
├── main.go
└── utils
├── add_test.go
└── math.go
你的代码编译时出现了问题：
$ go build
然后我运行生成的二进制文件：
$ ./example
当前数字：1
当前数字：2
当前数字：3
得到的答案：6
我想指出的是，我没有设置GOPATH或任何其他GO*环境变量来使其工作。
英文:
I don't see any problems with your code when building it using go 1.16.6. If I start a new go project:
mkdir example
cd example
go mod init example
Then place your code in the utils/ directory, and place the following in main.go:
package main
import (
"example/utils"
"fmt"
)
func main() {
answer := utils.Add(1, 2, 3)
fmt.Printf("got answer: %d\n", answer)
}
So that I have the follow layout:
$ tree .
.
├── example
├── go.mod
├── main.go
└── utils
├── add_test.go
└── math.go
Your code compiles with a problem:
$ go build
And I run the resulting binary:
$ ./example
Current Number: 1
Current Number: 2
Current Number: 3
got answer: 6
I would like to point out that I haven't set GOPATH or any other GO* environment variables for this to work.
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