呼叫具有可能的格式指令 [英] Call has possible formatting directive

问题描述

当我运行这段代码时

package main
import ("fmt")
func main() {
    i := 5
    fmt.Println("Hello, playground %d",i)
}

(游乐场链接)

我收到以下警告:prog.go:5:Println调用具有可能的格式指令％d兽医退出了.

I get the following warning: prog.go:5: Println call has possible formatting directive %d Go vet exited.

执行此操作的正确方法是什么?

What is a proper way to do this?

推荐答案

fmt.Println 不会格式化％d 之类的格式.相反，它使用其参数的默认格式，并在参数之间添加空格.

fmt.Println doesn't do formatting things like %d. Instead, it uses the default format of its arguments, and adds spaces between them.

fmt.Println("Hello, playground",i)  // Hello, playground 5

如果要使用printf样式格式，请使用 fmt.Printf .

If you want printf style formatting, use fmt.Printf.

fmt.Printf("Hello, playground %d\n",i)

您无需特别说明类型.％v 通常会弄清楚.

And you don't need to be particular about the type. %v will generally figure it out.

fmt.Printf("Hello, playground %v\n",i)

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