// helloworld.go

package main

import "fmt"

func main() {

    fmt.Println("Hello,	世界")

}

go run helloworld.go

go build helloworldgo

./helloworld

package  main

import (

  "fmt"

  "os"

)

func main() {

  var s, sep string

  for i := 1; i < len(os.Args); i++ {

    s += sep + os.Args[i]

    sep = " "

  }

  fmt.Println(s)

}

import (

  "fmt"

  "os"

)

func main() {

  var s, sep string

  for i, arg := range os.Args[1] {

    fmt.Println(i, arg)

    s += sep + arg

    sep = " "

  }

  fmt.Println(s)

}

package main

import (

    "fmt"

    "net/http"

)

func IndexHandler(w http.ResponseWriter, r *http.Request) {

    fmt.Fprintln(w, "hello world")

}

func main() {

    http.HandleFunc("/", IndexHandler)

    http.ListenAndServe("127.0.0.1:8000", nil)

}

package main

import (

    "log"

    "net/http"

    "github.com/prometheus/client_golang/prometheus/promhttp"

)

func main() {

    http.Handle("/metrics", promhttp.Handler())

    log.Fatal(http.ListenAndServe(":8080", nil))

}