/**
* This method computes the nth factorial number.
*
* @access public
* @static
* @param IInt32\Type $n the operand
* @return IInt32\Type the result
*/
public static function factorial(IInt32\Type $n) : IInt32\Type
{
return IInt32\Module::eq($n, IInt32\Type::zero())->unbox() ? IInt32\Type::one() : IInt32\Module::multiply($n, IInt32\Module::factorial(IInt32\Module::decrement($n)));
}
/**
* This method tests the "factorial" method.
*
* @dataProvider data_factorial
*/
public function test_factorial(array $provided, array $expected)
{
$p0 = IInt32\Module::factorial(IInt32\Type::box($provided[0]));
$e0 = $expected[0];
$this->assertInstanceOf('\\Saber\\Data\\IInt32\\Type', $p0);
$this->assertEquals($e0, $p0->unbox());
}
