How to convert uint8 to string

I want to convert uint8 to string but can't figure out how.

package main

import "fmt"
import "strconv"

func main() {
    str := "Hello"
	fmt.Println(str[1])  // 101

    fmt.Println(strconv.Itoa(str[1]))
}

Example

This gives me prog.go:11: cannot use str[1] (type uint8) as type int in function argument
[process exited with non-zero status]

Any idea?

Simply convert it :

fmt.Println(strconv.Itoa(int(str[1])))

There is a difference between converting it or casting it, consider:

var s uint8 = 10
fmt.Print(string(s))
fmt.Print(strconv.Itoa(int(s)))

The string cast prints '\n' (newline), the string conversion prints "10". The difference becomes clear once you regard the []byte conversion of both variants:

[]byte(string(s)) == [10] // the single character represented by 10
[]byte(strconv.Itoa(int(s))) == [49, 48] // character encoding for '1' and '0'

<iframe src="http://play.golang.org/p/kek9D7ol22" frameborder="0" style="width: 100%; height: 100%"><a href="http://play.golang.org/p/kek9D7ol22">see this code in play.golang.org</a></iframe>

You can do it even simpler by using casting, this worked for me:

var c uint8
c = 't'
fmt.Printf(string(c))

There are no automatic conversions of basic types in Go expressions. See https://talks.golang.org/2012/goforc.slide#18. A byte (an alias of uint8) or []byte ([]uint8) has to be set to a bool, number or string.

package main

import (
	. "fmt"
)

func main() {
	b := []byte{'G', 'o'}
	c := []interface{}{b[0], float64(b[0]), int(b[0]), rune(b[0]), string(b[0]), Sprintf("%s", b), b[0] != 0}
	checkType(c)
}

func checkType(s []interface{}) {
	for k, _ := range s {
		// uint8 71, float64 71, int 71, int32 71, string G, string Go, bool true
		Printf("%T %v\n", s[k], s[k])
	}
}

Sprintf("%s", b) can be used to convert []byte{'G', 'o' } to the string "Go". You can convert any int type to a string with Sprintf. See https://stackoverflow.com/a/41074199/12817546.

But Sprintf uses reflection. See the comment in https://stackoverflow.com/a/22626531/12817546. Using Itoa (Integer to ASCII) is faster. See @DenysSéguret and https://stackoverflow.com/a/38077508/12817546. Quotes edited.

use %c

	str := "Hello"
	fmt.Println(str[1]) // 101
	fmt.Printf("%c\n", str[1])