Printing strings and characters as hexadecimal in Go-CodePudding

Why cyrillic strings in hexadecimal format differ from cyrillic chars in hexadecimal format?

str  := "Э"
fmt.Printf("%x\n", str)
//result d0ad
    
str  := 'Э'
fmt.Printf("%x\n", str)
//result 42d

CodePudding user response：

Printing the hexadecimal representation of a string prints the hex representation of its bytes, and printing the hexadecimal representation of a rune prints the hex representation of the number it is an alias to (rune is an alias to int32).

And strings in Go hold the UTF-8 encoded byte sequence of the text. In UTF-8 representation characters (runes) having a numeric code > 127 have multi-byte representation.

The rune Э has multi-byte representation in UTF-8 (being [208, 173]), and it is not the same as the multi-byte representation of the 32-bit integer 1069 = 0x42d. Integers are represented using two's complement in memory.

Recommended blog post: Strings, bytes, runes and characters in Go