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"
"strconv"
)
func main() {
ships := []string{"Normandy", "Verrikan", "Nexus", "Warsaw"}
fmt.Printf("%q\n\n", ships)
from, to := 0, len(ships)
switch poss := os.Args[1:]; len(poss) {
default:
fallthrough
case 0:
fmt.Println("Provide only the [starting] and [stopping] positions")
return
case 2:
to, _ = strconv.Atoi(poss[1])
fallthrough
case 1:
from, _ = strconv.Atoi(poss[0])
}
if l := len(ships); from < 0 || from > l || to > l || from > to {
fmt.Println("Wrong positions")
return
}
fmt.Println(ships[from:to])
}
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