/** @test */
public function should_subtract_two_numbers()
{
$command = new SubtractCommand(new AnyNumber(15.8889), new AnyNumber(2.1237), new PositiveNumber(4));
$total = $command->run();
$this->assertInstanceOf('PhilipBrown\\Math\\Number', $total);
$this->assertEquals(13.7652, $total->value());
}
/**
* Subtract two numbers
*
* @param mixed $left
* @param mixed $right
* @param mixed $scale
* @return Number
*/
public static function subtract($left, $right, $scale = 0)
{
$left = new AnyNumber($left);
$right = new AnyNumber($right);
$scale = new PositiveNumber($scale);
$command = new SubtractCommand($left, $right, $scale);
return $command->run();
}