GO求平均值

package main

import "fmt"

func main(){
    sum:=0.0
    avg:=0.0
    xs:=""
    switch len(xs){
        case :
        avg=
        default:
        for _,v:=range xs{
            sum+=float64(v)
        }
        avg=sum/float64(len(xs))
    }

    fmt.Println(float64(len(xs)))

    fmt.Println(sum)

    _=avg;
    fmt.Println(avg)

}