const 常量,可指出类型or不不显式指类型可以隐式转换类型

const 枚举 iota 自增符

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const a int =1
const b = 2

const (
		a = 0
		b
		c
		d

	)
fmt.Println(a,b,c,d)
// 0 0 0 0

const(
	a = iota
	b
	c
	d
)
fmt.Println(a,b,c,d)
//0 1 2 3

//b kb mb gb tb pb
const (
	b  = 1 << (10 * iota)
	kb
	mb
	gb
	tb
	pb
)
fmt.Println(b, kb, mb, gb, tb, pb)
//1 1024 1048576 1073741824 1099511627776 1125899906842624