Go之分组声明

package main;
 
import (
    "fmt"
);
 
func main() {
    //分组定义类型
    type {
        F64 float64;
        STR string;
    };
    //分组定义常量
    const (
        PI = 3.14;
        CNT = 1000;
        PRE = "db_";
    );
    //分组声明变量
    var (
        i int;
        pi float32;
        pre string;
    );
    //iota枚举
    const (
        a = iota;
        b = iota;
        c = iota;
    );
    //每遇到一个const关键字，iota就会重置
    const d = iota;
 
    fmt.Printf("%d %d %d %d",d);
}