main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
"os"
"strings"
)
const usage = `[command] [string]
Available commands: lower, upper and title`
func main() {
args := os.Args
if len(args) != 3 {
fmt.Println(usage)
return
}
cmd, str := args[1], args[2]
switch cmd {
case "lower":
fmt.Println(strings.ToLower(str))
case "upper":
fmt.Println(strings.ToUpper(str))
case "title":
fmt.Println(strings.Title(str))
default:
fmt.Printf("Unknown command: %q\n", cmd)
}
}
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