range_string.go

package main

import "fmt"

func main() {
	str := "Go is a beautiful language!"
	fmt.Printf("The length of str is: %d\n", len(str))
	for pos, char := range str {
		fmt.Printf("Character on position %d is: %c \n", pos, char)
	}
	fmt.Println()
	str2 := "Chinese: 日本語"
	fmt.Printf("The length of str2 is: %d\n", len(str2))
	for pos, char := range str2 {
		fmt.Printf("character %c starts at byte position %d\n", char, pos)
	}
	fmt.Println()
	fmt.Println("index int(rune) rune    char bytes")
	for index, rune := range str2 {
		fmt.Printf("%-2d      %d      %U '%c' % X\n", index, rune, rune, rune, []byte(string(rune)))
	}
}

/* Output:
The length of str is: 27
Character on position 0 is: G
Character on position 1 is: o
Character on position 2 is:
Character on position 3 is: i
Character on position 4 is: s
Character on position 5 is:
Character on position 6 is: a
Character on position 7 is:
Character on position 8 is: b
Character on position 9 is: e
Character on position 10 is: a
Character on position 11 is: u
Character on position 12 is: t
Character on position 13 is: i
Character on position 14 is: f
Character on position 15 is: u
Character on position 16 is: l
Character on position 17 is:
Character on position 18 is: l
Character on position 19 is: a
Character on position 20 is: n
Character on position 21 is: g
Character on position 22 is: u
Character on position 23 is: a
Character on position 24 is: g
Character on position 25 is: e
Character on position 26 is: !

The length of str2 is: 18
character C starts at byte position 0
character h starts at byte position 1
character i starts at byte position 2
character n starts at byte position 3
character e starts at byte position 4
character s starts at byte position 5
character e starts at byte position 6
character : starts at byte position 7
character   starts at byte position 8
character 日 starts at byte position 9
character 本 starts at byte position 12
character 語 starts at byte position 15

index int(rune) rune    char bytes
0       67      U+0043 'C' 43
1       104      U+0068 'h' 68
2       105      U+0069 'i' 69
3       110      U+006E 'n' 6E
4       101      U+0065 'e' 65
5       115      U+0073 's' 73
6       101      U+0065 'e' 65
7       58      U+003A ':' 3A
8       32      U+0020 ' ' 20
9       26085      U+65E5 '日' E6 97 A5
12      26412      U+672C '本' E6 9C AC
15      35486      U+8A9E '語' E8 AA 9E
*/