str := strconv.Itoa(12)
println("str + '23' = ", str+"23")

n, err := strconv.Atoi("123")
if err!=nil {
	panic(err)
}
println("12+n = ", 12+n)

// `結果`
12+n =  135
str + '23' =  1223

func Sprintf(format string, a ...interface{}) string

str := fmt.Sprintf("123%s", "hello")
//輸出：`123hello`

func Join(a []string, sep string) string

str := []string{"hello", "world"}
s := strings.Join(str, " ")
//輸出：`hello world`

var build strings.Builder
build.WriteString("123")
build.WriteString("ade")
build.WriteString("ade")
build.WriteString("ade")
println(build.String())
//輸出：`123adeadeade`

buffer := bytes.Buffer{}
buffer.WriteString("hello")
buffer.WriteString("golang")
println(buffer.String())
//輸出：`hellogolang`

    package main
    import (
        "fmt"
        "strconv"
    )
    func main() {
        str := "123"
        num, err := strconv.Atoi(str)
        if err!= nil {
            fmt.Println("轉(zhuǎn)換錯誤:", err)
        } else {
            fmt.Println("轉(zhuǎn)換后的整數(shù):", num)
        }
        num = 456
        str = strconv.Itoa(num)
        fmt.Println("轉(zhuǎn)換后的字符串:", str)
    }