go 学习字符串

package main

import (
	"fmt"
	"unicode"
)

// HanCount 计算汉字个数
func HanCount(s string) uint64 {
	var count uint64
	for _, c := range s {
		if unicode.Is(unicode.Han, c) {
			count++
		}
	}

	return count
}

func main() {
	s1 := "我们"
	// s1[0] = "你" // cannot assign to s1[0] (value of type byte)
	// s1[0] = '你' // cannot assign to s1[0] (value of type byte)

	s2 := []rune(s1) //把字符串强制转换成一个rune切片
	// s2[0] = "你"      // cannot use "你" (untyped string constant) as rune value in
	s2[0] = '你'
	fmt.Println(s2)         //是unicode 编码
	fmt.Println(string(s2)) //把rune切片转换为字符串

	//计算字符串中的汉字的个数
	s3 := "我爱你，中国5201314"
	fmt.Println(s3)
	fmt.Println(HanCount(s3))

	s4 := "我" //s4:string
	s5 := '我' //s5:int32
	fmt.Printf("s4:%T s5:%T\n\n", s4, s5)

	s6 := "Hello，中国" //一个汉字占3个字节
	for i, v := range s6 {
		fmt.Printf("%d %c # %v %v\n", i, v, i, v)
	}
}