golang-101-hacks(19)——switch
注：本文是对golang-101-hacks中文翻译。
和其他编程语言(例如C)相比，Go语音的switch-case语句不需要显式的添加“break”，也没有fall-though。如下面代码所示:
Compared to other programming languages (such as C), Go's switch-case statement doesn't need explicit "break", and not have fall-though characteristic. Take the following code as an example:
package main
import (
"fmt"
)
func checkSwitch(val int) {
switch val {
case 0:
case 1:
fmt.Println("The value is: ", val)
}
}
func main() {
checkSwitch(0)
checkSwitch(1)
}输出结果是
The value is: 1期望当val为0或1时，执行fmt.Println("The value is: "， val)，但实际上，该语句只在val为1时生效。为了得到期望结果，有两种方法:
使用fallthrough：
func checkSwitch(val int) {
switch val {
case 0:
fallthrough
case 1:
fmt.Println("The value is: ", val)
}
}(2)将0和1放在同一个的case语句下:
func checkSwitch(val int) {
switch val {
case 0, 1:
fmt.Println("The value is: ", val)
}
}与if-else相比，switch语句表达判断更清晰和简单：
package main
import (
"fmt"
)
func checkSwitch(val int) {
switch {
case val < 0:
fmt.Println("The value is less than zero.")
case val == 0:
fmt.Println("The value is qual to zero.")
case val > 0:
fmt.Println("The value is more than zero.")
}
}
func main() {
checkSwitch(-1)
checkSwitch(0)
checkSwitch(1)
}输出结果
The value is less than zero.
The value is qual to zero.
The value is more than zero.本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2019.06.20 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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