Go语言练习 Rot13

地址：https://tour.go-zh.org/methods/23

package mainimport (
"io"
"os"
"strings"
)type rot13Reader struct {
r io.Reader
}func rot13(x byte) byte{
lower := x<='z'&&x>='a'
upper := x<='Z'&&x>='A'
if (!lower)&&(!upper){
return x
}
x += 13
if lower&&x>'z'{
return x-26
}
if upper&&x>'Z'{
return x-26
}
return x
}func (rot *rot13Reader) Read(b []byte) (n int,e error){
n,e = rot.r.Read(b)
for i:=0;i<n;i++{
b[i] = rot13(b[i])
}
return n,e
}func main() {
s := strings.NewReader("Lbh penpxrq gur pbqr!")
r := rot13Reader{s}
io.Copy(os.Stdout, &r)
}