Command line flags & sorting algorithms

Question

I've made my first-ever program in Go, which sorts a given input of integers. There are 2 options: The list of unsorted integers and the algorithm to use.

Since it's my first go project I'm a bit unsure of a few things. For example, the "floating" variable declarations.

I think that the algorithms itself are okay, therefore I only post the executable program:

package main
import (
 "fmt"
 "flag"
 "strings"
 "strconv"
 "os"
 "github.com/afroewis/go-sorting-algorithms/sortalgos"
)
func main() {
 inputFlag := flag.String("input", "", "Input numbers to sort. Example: 10 20 5 1003 94 928")
 algoFlag := flag.String("algo", "", "Sorting algo to use. Available values: bubble, selection, insertion. ")
 flag.Parse()
 // Parse input
 input := strings.Split(*inputFlag, " ")
 var numbers [] int
 for i := 0; i < len(input); i++ {
 val, err := strconv.Atoi(input[i])
 if err != nil {
 panic(err)
 }
 numbers = append(numbers, val)
 }
 var result []int;
 switch *algoFlag {
 case "bubble":
 result = sortalgos.BubbleSort(numbers)
 case "selection":
 result = sortalgos.SelectionSort(numbers)
 case "insertion":
 result = sortalgos.InsertionSort(numbers)
 case "":
 fmt.Println("Error: -algo flag not set. For usage infos use ./main -help")
 os.Exit(1)
 }
 fmt.Println(result)
}

Answer 1

I recommend looping through slice with range syntax.

for _, v := range(input) {
 val, err := strconv.Atoi(v)
 if err != nil {
 panic(err)
 }
 numbers = append(numbers, val)
}

You can replace case "" with default.

Besides that, it looks OK to me.