Last active
March 13, 2024 20:41
-
-
Save edwardmp/3aca97114eb19089e18d to your computer and use it in GitHub Desktop.
A Tour of Go, exercise rot13Reader
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
package main | |
import ( | |
"io" | |
"os" | |
"strings" | |
) | |
type rot13Reader struct { | |
r io.Reader | |
} | |
func (rot *rot13Reader) Read(p []byte) (n int, err error) { | |
n, err = rot.r.Read(p) | |
for i := 0; i < len(p); i++ { | |
if p[i] >= 'A' && p[i] < 'Z' { | |
p[i] = 65 + (((p[i] - 65) + 13) % 26) | |
} else if p[i] >= 'a' && p[i] <= 'z' { | |
p[i] = 97 + (((p[i] - 97) + 13) % 26) | |
} | |
} | |
return | |
} | |
func main() { | |
s := strings.NewReader("Lbh penpxrq gur pbqr!") | |
r := rot13Reader{s} | |
io.Copy(os.Stdout, &r) | |
} |
package main
import (
"io"
"os"
"strings"
)
type rot13Reader struct {
r io.Reader
}
func (rot *rot13Reader) Read(p []byte) (n int, err error) {
n, err = rot.r.Read(p)
for i := 0; i < len(p); i++ {
if p[i] >= 'A' && p[i] < 'Z' {
p[i] = 65 + (((p[i] - 65) + 13) % 26)
} else if p[i] >= 'a' && p[i] <= 'z' {
p[i] = 97 + (((p[i] - 98) + 13) % 26)
}
}
return
}
func main() {
s := strings.NewReader("Lbh penpxrq gur pbqr!")
r := rot13Reader{s}
io.Copy(os.Stdout, &r)
}
package main
import (
"io"
"os"
"strings"
)
type rot13Reader struct {
r io.Reader
}
func (r *rot13Reader) Read(b []byte) (int, error) {
if n, err := r.r.Read(b); err != nil {
return n, err
}
for i, v := range b {
if v > 64 && v < 91 {
b[i] = (v - 65 + 13) % 26 + 65
} else if v > 96 && v < 123 {
b[i] = (v - 97 + 13) % 26 + 97
}
}
return len(b), nil
}
func main() {
s := strings.NewReader("Lbh penpxrq gur pbqr!")
r := rot13Reader{s}
io.Copy(os.Stdout, &r)
}
package main
import (
"io"
"os"
"strings"
)
type rot13Reader struct {
r io.Reader
}
func (rot13 rot13Reader) Read(out []byte) (int, error) {
n, err := rot13.r.Read(out)
if err != nil {
return n, err
}
for i := 0; i < len(out); i++ {
if out[i] >= 'A' && out[i] <= 'Z' {
out[i] = 'A' + (((out[i] - 'A') + 13) % 26)
}
if out[i] >= 'a' && out[i] <= 'z' {
out[i] = 'a' + (((out[i] - 'a') + 13) % 26)
}
}
return n, nil
}
func main() {
s := strings.NewReader("Lbh penpxrq gur pbqr!")
r := rot13Reader{s}
io.Copy(os.Stdout, &r)
}
I wanted to do compact & efficient :)
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
package main
import (
"io"
"os"
"strings"
)
type rot13Reader struct {
r io.Reader
}
func main() {
s := strings.NewReader("Lbh penpxrq gur pbqr!")
r := rot13Reader{s}
io.Copy(os.Stdout, r)
}
func (rot rot13Reader) Read(b []byte) (int, error) {
v, err := rot.r.Read(b)
}
func rot13(s string) (string) {
s = strings.ToUpper(s)
}