常量：只能读，不能修改，编译前就是确定的值
关键字: const
常量相关类型：int8,16,32,64 float32,64 bool string 可计算结果数学表达式
常量方法 iota
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
package main
import "fmt"
func main() {
const name = "BeinMenChuiXue"
fmt.Println(name)
const (
homeAddr = "earth"
nickName = "WeiLaiShiXuePai"
)
fmt.Println(homeAddr, nickName)
const (
zero = iota
one
two = iota
three
)
fmt.Println(zero, one, two, three)
const (
first = iota
second
)
fmt.Println(first, second)
const (
student = "Golang"
teacher
parents = "S"
children
)
fmt.Println(student, teacher, parents, children)
}
|
观察输出结果，得出以下有关常量特性
1. 定义多个常量推荐使用括号
2. iota每往下一行自增1并赋值给这一行的常量，遇到下一个const重新从0开始
3. 常量未赋值，往上找最近有值的常量并赋值给自己