go语言基础之iota枚举

1、iota （在常量的时候，当成枚举使用）

示例1

package main

import "fmt"

func main() {
	//1、iota常量自动生成器，每个一行，自动累加1
	//2、iota给常量赋值使用
	const (
		a = iota
		b = iota
		c = iota
	)
	fmt.Printf("a = %d, b = %d, c = %d
", a, b, c)

	//3、iota遇到const，重置为0
	const d = iota
	fmt.Printf("d = %d
", d)
}

#执行结果

a = 0, b = 1, c = 2
d = 0　

示例2：

package main

import "fmt"

func main() {
	//1、iota常量自动生成器，每个一行，自动累加1
	//2、iota给常量赋值使用
	const (
		a1 = iota //0
		b1
		c1
	)
	fmt.Printf("a1 = %d, b1 = %d, c1 = %d
", a1, b1, c1)
}

#执行结果

a1 = 0, b1 = 1, c1 = 2

　　

示例3

package main

import "fmt"

func main() {
	//1、iota常量自动生成器，每个一行，自动累加1
	//2、iota给常量赋值使用
	const (
		i          = iota
		j1, j2, j3 = iota, iota, iota
		k          = iota
	)
	fmt.Printf("i = %d, j1 = %d, j2 = %d, j3 = %d, k = %d
", i, j1, j2, j3, k)
}

#执行结果　

i = 0, j1 = 1, j2 = 1, j3 = 1, k = 2