day04 Go 字符和字符串处理

1、例题

package main

import (
	"fmt"
	"unicode/utf8"
)

// 统计字符长度
func main()  {
	s := "Yes我爱go&python!"
	fmt.Println("len(s) =",len(s))
	fmt.Printf("%X \n",[]byte(s))

	for _,b := range []byte(s) {
		fmt.Printf("%X ",b)
	}
	fmt.Println()

	// 发现中文占了3个字符
	for i,ch := range s {  //ch is rune
		fmt.Printf("[%d %X] ",i,ch)
	}
	fmt.Println()

	// 统计rune长度
	fmt.Println("rune count: ",utf8.RuneCountInString(s))

	// byte 转 rune
	bytes := []byte(s)
	//fmt.Println(len(bytes))
	fmt.Println(bytes)

	for len(bytes) > 0 {
		ch , size := utf8.DecodeRune(bytes)
		bytes = bytes[size:]
		//fmt.Println(bytes)
		//fmt.Println(size)
		fmt.Printf("%c ",ch)
	}
	fmt.Println()

	for i,ch := range []rune(s) {
		fmt.Printf("[%d %c] ",i,ch)
	}

}