package main

import (
	"fmt"
	"math"
)

// 常量定义
func consts() {
	const  filename  = "abc.txt"
	const a,b  = 4,5
	var c int
	c = int(math.Sqrt(a*a + b*b))
	fmt.Println(filename,c)
}

// 枚举
func enums () {

  // 普通枚举类型
	const (
		java = 1
		c = 2
		python = 3
		golang = 4

		)

	fmt.Println(java,c,python,golang)

	// 自增枚举
	const (
		lua  = iota
		_
		shell
		perl
		css
		js
	)
	fmt.Println(lua,shell,perl,css,js)

	// k,kb,mb,gb.tb,pb,eb
	const (
		b = 1 << (10*iota)
		kb
		mb
		gb
		pb
		eb
	)
	fmt.Println(b,kb,mb,gb,pb,eb)
}

func main ( )  {
	fmt.Println("hello world!")
	consts()
	enums()
}