I am newbie at Go and I wish to iterate the characters of a string
package main
import (
"fmt"
)
func main() {
var a string = "abcd"
for i, c := range a {
fmt.Printf("%d %s
", i, c)
}
}
I want the output to be
0 a
1 b
2 c
3 d
but it's not. What am I doing wrong?
Fix the go vet and package fmt format error messages (type rune is an alias for type int32):
10: Printf format %s has arg c of wrong type rune
0 %!s(int32=97)
1 %!s(int32=98)
2 %!s(int32=99)
3 %!s(int32=100)
Playground: https://play.golang.org/p/oM9D8oNlaAO
A rune is a Unicode code point (character), not a string.
Use %c not%s. For example,
package main
import (
"fmt"
)
func main() {
var a string = "abcd"
for i, c := range a {
fmt.Printf("%d %c
", i, c)
}
}
Playground: https://play.golang.org/p/LFQPGZ9X5kk
Output:
0 a
1 b
2 c
3 d
An example of type string UTF-8 variable-length encoding:
package main
import (
"fmt"
)
func main() {
var a string = "Greece Ελλάδα"
for i, c := range a {
fmt.Printf("%2d %c
", i, c)
}
}
Playground: https://play.golang.org/p/Fdgg6UMXAAt
Output:
0 G
1 r
2 e
3 e
4 c
5 e
6
7 Ε
9 λ
11 λ
13 ά
15 δ
17 α
References: