GO语言练习：switch基本用法

 1 package main
 2 import "fmt"
 3 
 4 func switch_1(i int){
 5     switch i { 
 6     case 0 : 
 7         fmt.Println("0 --: i = ", i); 
 8     case 1:
 9         fmt.Println("1 --: i = ", i); 
10     case 2:
11         fmt.Println("2 --: i = ", i); 
12         fallthrough
13     case 3:
14         fmt.Println("3 --: i = ", i); 
15     case 4, 5, 6:
16         fmt.Println("4, 5, 6 --: i = ", i); 
17         default :
18         fmt.Println("Default --: i = ", i); 
19     }   
20 }
21 
22 func switch_2(i int){
23     switch {
24     case 0 <= i && i <= 3 :
25         fmt.Println("0-3: i = ", i)
26     case 4 <= i && i <= 6 :
27         fmt.Println("4-6: i = ", i)
28     case 7 <= i && i <= 9 :
29         fmt.Println("7-9: i = ", i)
30     }
31 }
32 
33 func main(){
34     for i := 0; i <= 6; i++ {
35         switch_1(i)
36     }
37     fmt.Println("------------------------------")
38     for i := 0; i <= 6; i++ {
39         switch_2(i)
40     }
41 }

$ go run switch.go 
0 --: i =  0
1 --: i =  1
2 --: i =  2
3 --: i =  2
3 --: i =  3
4, 5, 6 --: i =  4
4, 5, 6 --: i =  5
4, 5, 6 --: i =  6
------------------------------
0-3: i =  0
0-3: i =  1
0-3: i =  2
0-3: i =  3
4-6: i =  4
4-6: i =  5
4-6: i =  6