Go基本数据类型和String转换

基本数据类型和String转换

1.基本类型 -> string

法一：fmt.Sprintf()

func main() {
	func main() {
	var t1 int = 1
	var t2 float64 = 1.1
	var t3 bool = false
	var t4 byte = 't'
	var str string

	//int
	str = fmt.Sprintf("%d", t1)
	fmt.Printf("%T %v\n", str, str)

	//float
	str = fmt.Sprintf("%f", t2)
	fmt.Printf("%T %q\n", str, str)
	
	//bool
	str = fmt.Sprintf("%t", t3)
	fmt.Printf("%T %q\n", str, str)

	//byte
	str = fmt.Sprintf("%c", t4)
	fmt.Printf("%T %q\n", str, str)
}

法二：strconv

func main() {
	var num1 int = 99
	var num2 float64 = 12.345
	var b1 bool = true
	var str string

	//int64
	str = strconv.FormatInt(int64(num1), 10)
	fmt.Printf("%T %q", str, str)

	//float
	str = strconv.FormatFloat(num2, 'f', 10, 64)
	fmt.Printf("%T %q", str, str)

	//bool
	str = strconv.FormatBool(b1)
	fmt.Printf("%T %q", str, str)
}

2.string -> 基本类型

strconv

func main() {
	var str1 string = "123"
	var str2 string = "123.456"
	var str3 string = "true"

    //int
	var n1 int64
	var n2 int
	n1 , _ = strconv.ParseInt(str1,10,64)
	n2 = int(n1)
	fmt.Printf("%T %v\n",n1,n1)
	fmt.Printf("%T %v\n",n2,n2)

    //float
	var f float64
	f , _ = strconv.ParseFloat(str2,64)
	fmt.Printf("%T %v\n",f,f)

    //bool
	var b bool
	b , _ = strconv.ParseBool(str3)
	fmt.Printf("%T %v\n",b,b)
}

注意：转换失败时，int、float等会转为0，bool转为false