public function testPow()
{
$a = 1234;
$b = '1234';
$c = '0x4D2';
$pow = '20';
$math = new BcEngine();
$this->assertEquals('67035243914691711794360082394262505332216263021359359696306176', $math->pow($a, $pow));
$this->assertEquals('67035243914691711794360082394262505332216263021359359696306176', $math->pow($b, $pow));
$this->assertEquals('67035243914691711794360082394262505332216263021359359696306176', $math->pow($c, $pow));
$this->assertEquals(1, $math->pow(1, 1));
}