golang uint 8 int 8 byte rune変換

	b := []byte{'h', 104, 101}	// 
	u8 := []uint8{'h', 104, 101}
	fmt.Printf("%T %T
", b, u8) //[]uint8 []uint8
	fmt.Println(string(b), string(u8)) // hhe hhe

	str2 := "hello "
	data2 := []byte(str2) // 
	fmt.Println(data2)    //[104 101 108 108 111 228 184 173 229 155 189]

	str2 = string(data2)
	fmt.Println(str2) //hello 

	//int8 ：-128~127
	var r byte
	var v int8
	v = -70
	r = byte(v) // ：v<0 256+v;v>0 v
	fmt.Println("int8->byte: ", r)
	// 
	var int32_1 int32 = -1
	fmt.Printf("%d,%.f", uint32(int32_1), math.Exp2(32)) //4294967295,4294967296
	
	// rune   byte
	rs := []rune{'H', 'e', 'l', 'l', 'o', ' ', ' ', ' '}
	bs := []byte(string(rs))
	fmt.Printf("%s", bs)
	fmt.Println(string(bs))

	rs=[]rune("Hello  ")
	bs=[]byte(string(rs))
	fmt.Printf("%s", bs)
	fmt.Println(string(bs))
	
	// uint8   byte
	intBs:=[]uint8(bs)
	fmt.Println(intBs,string(intBs))