go语言中range用法
package main
import (
"fmt"
)
func main() {
sum := 0.0
var avg float64
xs := []float64{1, 2, 3, 4, 5, 6}
switch len(xs) {
case 0:
avg = 0
default:
for _, v := range xs {//下划线表示那个值舍去，即舍去下标索引
sum += v
}
avg = sum / float64(len(xs))
}
fmt.Println(avg)
}