iota
1 //iota作用会自动递增,引用自己定义的表达式。
2
3
4 //定义所有星期,从0到6
5 package main
6
7 import "fmt"
8
9 const (
10 Sunday = iota //重点
11 Monday
12 Tuesday
13 Wednesday
14 Thursday
15 Friday
16 Saturday
17 )
18
19 func main() {
20
21 //从第二个开始,自动引用排头兵的表达式,但iota逐一递增.
22 fmt.Println(Sunday, Monday, Tuesday) //0 1 2
23
24 }
1 ////定义所有星期,从1到7
2 package main
3
4 import "fmt"
5
6 const (
7 Monday = iota +1 //0 +1 = 1 //重点
8 Tuesday
9 Wednesday
10 Thursday
11 Friday
12 Saturday
13 Sunday
14 )
15
16 func main() {
17
18 //从第二个开始,自动引用排头兵的表达式,但iota逐一递增.
19 fmt.Println(Monday, Tuesday) //1 2
20
21 }
1 //定义5大常任理事国编号100-500
2
3 package main
4
5 import "fmt"
6
7 const (
8 USA = (iota + 1) * 100 //重点
9 China
10 Russia
11 Britain
12 France
13 )
14
15 func main() {
16
17 fmt.Println(USA, China, Russia, Britain, France) //100 200 300 400 500
18
19 }