Go switch
Go switch
Go switch 语句 从多个条件执行一个语句。类似于 if-else-if 链式语句。
语法:
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 是一个可以是任何类型的变量,而 val1, val2, ... 是 var1 的可能值。
在 switch 语句中,一个以上的值可以被测试case,值显示在逗号分隔的列表中
like: case val1, val2, val3:
如果匹配任何 case,则对应的 case语句被执行。在这里,break 关键字是隐式的。所以自动失败不是 Go switch 语句中的默认行为。
对于 Go switch 语句中的 fall-through,在分支的末尾使用关键字"fallthrough"。
Go Switch 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
或
输出:
Enter Number: 35
It is not 10,20,30,40
Go switch fallthrough 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