1. package main
    3. import "fmt"
    5. //const 来定义枚举类型
    6. const(
    7.     BEIJING = 0
    8.     SHANGHAI = 1
    9.     SHANDONG = 2
    10. )
    11. const(
    12.     //可以在 const() 添加一个关键字 iota，每行iota都会累加1，第一行的iota的默认值是0
    13.     //iota只能在const一起使用
    14.     JINAN = iota //iota = 0
    15.     QINGDAO         //iota = 1
    16.     TAIAN         //iota = 2
    17. )
    18. const(
    19.     AA = 10*iota //iota = 0
    20.     BB         //iota = 1
    21.     CC         //iota = 2
    22. )
    23. const(
    24.     a,b = iota+1,iota+2 // iota = 0 ,a = 1,b = 2
    25.     c,d                    //iota = 1,c = 2, d = 3
    26.     e,f                 //iota = 2,e = 3, f = 4
    28.     g,h = iota*2,iota*3 //iota = 3,g = 6,h = 9
    29.     i,k                    //iota = 4,i = 8,k = 12
    30. )
    31. func main()  {
    32.     //常量（只读属性，不允许修改）
    33.     const length int = 10
    34.     fmt.Println(length)
    36.     fmt.Println("JINAN = ",JINAN) //JINAN =  0
    37.     fmt.Println("QINGDAO = ",QINGDAO) //QINGDAO =  1
    38.     fmt.Println("TAIAN = ",TAIAN) //TAIAN =  2
    40.     fmt.Println("AA = ",AA) //AA =  0
    41.     fmt.Println("BB = ",BB) //BB =  10
    42.     fmt.Println("CC = ",CC) //CC =  20
    43. }