Created
May 18, 2018 10:59
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A Tour of Go - Exercise: rot13Reader
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package main | |
import ( | |
"io" | |
"os" | |
"strings" | |
) | |
type rot13Reader struct { | |
r io.Reader | |
} | |
func (reader rot13Reader) Read (b []byte) (int, error) { | |
n, e := reader.r.Read(b) | |
for i, v := range(b) { | |
if v >= 'A' { | |
if v < 'A' + 26 { | |
b[i] = 'A' + (v - 'A' + 13) % 26 | |
} else if v < 'a' + 26 { | |
b[i] = 'a' + (v - 'a' + 13) % 26 | |
} | |
} | |
} | |
return n, e | |
} | |
func main() { | |
s := strings.NewReader("Lbh penpxrq gur pbqr!") | |
r := rot13Reader{s} | |
io.Copy(os.Stdout, &r) | |
} |
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