// rune is an alias for int32 and is equivalent to int32 in all ways. It is
// used, by convention, to distinguish character values from integer values.
type rune = int32

var r1 rune = 'A'
var r2 rune = '你'
var r3 rune = '\U0001F600'  // 笑臉表情的 Unicode 碼點(diǎn)是 U+1F600

fmt.Printf("r1: %c\n", r1)  // 輸出: r1: A
fmt.Printf("r2: %c\n", r2)  // 輸出: r2: 你
fmt.Printf("r3: %c\n", r3)  // 輸出: r3:

str := "你好，世界！"
r := []rune(str)
fmt.Printf("%c\n", r[0])  // 輸出: 你

var r rune = 'A'
var i int = int(r)

package main

import (
   "fmt"
   "unicode/utf8"
)

func main() {
   var str = "hello,世界"
   //計(jì)算占用的字節(jié)數(shù)
   fmt.Println("字節(jié)數(shù):", len(str))

   //以下兩種都可以得到str的字符數(shù)
   //unicode/utf8包提供了獲取字符數(shù)的方法
   fmt.Println("字符數(shù):", utf8.RuneCountInString(str))
   //通過rune類型處理unicode字符方式
   fmt.Println("字符數(shù):", len([]rune(str)))
}