package main
import (
"fmt"
)
func main() {
fmt.Printf("%c, %x, %x", 'ᚵ', 'ᚵ', "ᚵ")
}
Outputs:
ᚵ, 16b5, e19ab5
Why does fmt.Printf("%x", 'ᚵ') ~> 16b5, while fmt.Printf("%x", "ᚵ") ~> e19ab5?
Viewed 72
1 Answers
Because each does a different thing. Both format the argument as a hexadecimal number, but each views the argument differently.
fmt.Printf("%x", 'ᚵ') prints a single unicode character (a rune, if you will), as a 32 bit integer (int32).
fmt.Printf("%x", "ᚵ") prints a string (individual bytes of a string) as 8 bit integers (uint8). The rune is encoded on three bytes when utf-8 encoding is used. That is a reason why there is six hexadecimal digits (two for each byte).
To study printing of a string in detail, start at function fmtString in file fmt/print.go.
func (p *pp) fmtString(v string, verb rune) {
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