public function calculate( ) {
$this->initializeCalculator( );
if( ! empty($_POST['hasSubmit']) ) {
$leftOperand = (isset($_POST['leftOperand']) ? (int)$_POST['leftOperand'] : null );
$rightOperand = (isset($_POST['rightOperand']) ? (int)$_POST['rightOperand'] : null );
$firstOperator = (isset($_POST['firstOperator']) ? $_POST['firstOperator'] : null );
$secondOperator = (isset($_POST['secondOperator']) ? $_POST['secondOperator'] : null );
if( $secondOperator != '=' ) {
$this->registry->template->firstOperator = $secondOperator;
}
$calculator = new Math( );
$calculator->setFirstOperand($leftOperand);
$calculator->setSecondOperand($rightOperand);
$calculator->setFirstOperator($firstOperator);
$calculator->setSecondOperator($secondOperator);
$this->registry->template->leftOperand = $calculator->calculate();
}
$this->registry->template->show('math_index');
}
