27 lines
554 B
Plaintext
27 lines
554 B
Plaintext
class Program {
|
|
|
|
string num2alpha(int $n) {
|
|
string $r = '';
|
|
for(int $i = 1; $n >= 0 && $i < 10; $i++) {
|
|
$r = chr(0x41 + ($n % pow(26, $i) / pow(26, $i - 1))) + $r;
|
|
$n -= pow(26, $i);
|
|
}
|
|
return $r;
|
|
}
|
|
|
|
int alpha2num(string $a) {
|
|
int $r = 0;
|
|
int $l = strlen($a);
|
|
for(int $i = 0; $i < $l; $i++) {
|
|
$r += pow(26, $i) * (ord($a[$l - $i - 1]) - 0x40);
|
|
}
|
|
return (int) $r - 1;
|
|
}
|
|
|
|
void main() {
|
|
import('math');
|
|
var_dump($this->alpha2num("Salut"), $this->num2alpha(1723), $this->num2alpha(9854), $this->alpha2num("Base64"));
|
|
}
|
|
|
|
}
|