golang快速入门-03-golang的常量和iota

　 0　const length int = 10

 1 //const 来定义枚举类型2 const (3     //可以在const() 添加一个关键字 iota， 每行的iota都会累加1, 第一行的iota的默认值是04     BEIJING = iota    //iota = 05     SHANGHAI          //iota = 16     SHENZHEN          //iota = 27 )8 9 
10 //const 来定义枚举类型
11 const (
12     //可以在const() 添加一个关键字 iota， 每行的iota都会累加1, 第一行的iota的默认值是0
13     BEIJING = 10*iota    //iota = 0
14     SHANGHAI          //iota = 10
15     SHENZHEN          //iota = 20
16 )
17 
18 // 公式继承，直到被覆盖
19 const (
20     a, b = iota+1, iota+2 // iota = 0, a = iota + 1, b = iota + 2, a = 1, b = 2
21     c, d                  // iota = 1, c = iota + 1, d = iota + 2, c = 2, d = 3
22     e, f                  // iota = 2, e = iota + 1, f = iota + 2, e = 3, f = 4
23 
24     g, h = iota * 2, iota *3  // iota = 3, g = iota * 2, h = iota * 3, g = 6, h = 9 
25     i, k                       // iota = 4, i = iota * 2, k = iota * 3 , i = 8, k = 12
26 )