package main //同文件包的声明 需要保持一直
import (
	"fmt"
	"strconv"
	"strings"
)

func main() {
	var s string = "golang你好"
	fmt.Println(len(s))

	for i, value := range s {
		fmt.Printf("%d", "%c", i, value)
	}
	r := []rune(s)
	for i := 0; i < len(r); i++ {
		fmt.Println(r[i])
	}
	num1, _ := strconv.Atoi("666")
	fmt.Println(num1)
	//整数转成字符串
	st1 := strconv.Itoa(88)
	fmt.Println(st1)
	//统计字符串中有几个相同的
	count := strings.Count("golanggolang", "golang")
	fmt.Println(count)
	//不区分大小写
	flag := strings.EqualFold("go", "GO")
	fmt.Println(flag)
	//区分大小写
	fmt.Println("hello" == "HELLO")
	//字符串替换
	ss := strings.Replace("gogogo", "go", "golang", -1)
	fmt.Println(ss)
	//按照字符串，为分割符标识，将字符串进行切割分成字符数组
	a := strings.Split("java-go", "-")
	fmt.Println(a)
	//大小写切换
	fmt.Println(strings.ToLower("GO"))
	fmt.Println(strings.ToUpper("go"))
	//去除空格！
	fmt.Println(strings.TrimSpace("   go   "))

}