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
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package mainimport "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