📜  GO语言 switch

📅  最后修改于: 2021-01-02 09:06:26             🧑  作者: Mango

转到开关

Go switch语句从多个条件中执行一个语句。它类似于if-else-if链语句。

句法:

switch  var1 {
case val1:
.....
case val2
.....
default:
.....
}

Go中的switch语句更加灵活。在上面的语法中,var1是可以是任何类型的变量,并且val1,val2,…是var1的可能值。

在switch语句中,在一种情况下可以测试多个值,这些值以逗号分隔的列表形式显示

例如:情况val1,val2,val3:

如果匹配任何大小写,则执行相应的case语句。在这里,break关键字是隐式的。因此,自动掉线不是Go switch语句中的默认行为。

对于Go switch语句中的穿透,在分支的末尾使用关键字“ fallthrough”。

转到开关示例:

package main
import "fmt"
func main() {
   fmt.Print("Enter Number: ")
  var input int
  fmt.Scanln(&input)
   switch (input) {
  case 10:
      fmt.Print("the value is 10")
    case 20:
      fmt.Print("the value is 20")
    case 30:
      fmt.Print("the value is 30")
    case 40:
      fmt.Print("the value is 40")
    default:
      fmt.Print(" It is not 10,20,30,40 ")
   }
}

输出:

Enter Number: 20
the value is 20

要么

输出:

Enter Number: 35
 It is not 10,20,30,40

转到开关失败示例

import "fmt"
func main() {
   k := 30
   switch k {
   case 10:
      fmt.Println("was <= 10"); fallthrough;
   case 20:
      fmt.Println("was <= 20"); fallthrough;
   case 30:
      fmt.Println("was <= 30"); fallthrough;
   case 40:
      fmt.Println("was <= 40"); fallthrough;
   case 50:
      fmt.Println("was <= 50"); fallthrough;
   case 60:
      fmt.Println("was <= 60"); fallthrough;
   default:
      fmt.Println("default case")
   }
}

输出:

was <= 30
was <= 40
was <= 50
was <= 60
default case