class BcMathCalculator

class BcMathCalculator extends Calculator {
    public function add(string $a, string $b) : string {
        return \bcadd($a, $b, 0);
    }
    public function sub(string $a, string $b) : string {
        return \bcsub($a, $b, 0);
    }
    public function mul(string $a, string $b) : string {
        return \bcmul($a, $b, 0);
    }
    public function divQ(string $a, string $b) : string {
        return \bcdiv($a, $b, 0);
    }
    public function divR(string $a, string $b) : string {
        return \bcmod($a, $b, 0);
    }
    public function divQR(string $a, string $b) : array {
        $q = \bcdiv($a, $b, 0);
        $r = \bcmod($a, $b, 0);
        return [
            $q,
            $r,
        ];
    }
    public function pow(string $a, int $e) : string {
        return \bcpow($a, (string) $e, 0);
    }
    public function modPow(string $base, string $exp, string $mod) : string {
        return \bcpowmod($base, $exp, $mod, 0);
    }
    public function sqrt(string $n) : string {
        return \bcsqrt($n, 0);
    }

}