<html>

<head>

<title>Quadratic Equation Solver</title>

</head>

<body>

<?php



/**	Error reporting		**/

error_reporting(E_ALL);



/**	Include path		**/

set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . '/../Classes/');



?>

<h1>Quadratic Equation Solver</h1>

<form action="Quadratic2.php" method="POST">

Enter the coefficients for the Ax<sup>2</sup> + Bx + C = 0

<table border="0" cellpadding="0" cellspacing="0">

	<tr><td><b>A&nbsp;</b></td>

		<td><input name="A" type="text" size="8" value="<?php echo (isset($_POST['A'])) ? htmlentities($_POST['A']) : ''; ?>"></td>

	</tr>

	<tr><td><b>B&nbsp;</b></td>

		<td><input name="B" type="text" size="8" value="<?php echo (isset($_POST['B'])) ? htmlentities($_POST['B']) : ''; ?>"></td>

	</tr>

	<tr><td><b>C&nbsp;</b></td>

		<td><input name="C" type="text" size="8" value="<?php echo (isset($_POST['C'])) ? htmlentities($_POST['C']) : ''; ?>"></td>

	</tr>

</table>

<input name="submit" type="submit" value="calculate"><br />

If A=0, the equation is not quadratic.

</form>



<?php

/**	If the user has submitted the form, then we need to execute a calculation **/

if (isset($_POST['submit'])) {

	if ($_POST['A'] == 0) {

		echo 'The equation is not quadratic';

	} else {

		/**	So we include PHPExcel to perform the calculations	**/

		include 'PHPExcel/Calculation.php';



		/**	Calculate and Display the results			**/

		echo '<hr /><b>Roots:</b><br />';



		$callStartTime = microtime(true);

		$discriminantFormula = '=POWER('.$_POST['B'].',2) - (4 * '.$_POST['A'].' * '.$_POST['C'].')';

		$discriminant = PHPExcel_Calculation::getInstance()->calculateFormula($discriminantFormula);



		$r1Formula = '=IMDIV(IMSUM(-'.$_POST['B'].',IMSQRT('.$discriminant.')),2 * '.$_POST['A'].')';

		$r2Formula = '=IF('.$discriminant.'=0,"Only one root",IMDIV(IMSUB(-'.$_POST['B'].',IMSQRT('.$discriminant.')),2 * '.$_POST['A'].'))';



		echo PHPExcel_Calculation::getInstance()->calculateFormula($r1Formula).'<br />';

		echo PHPExcel_Calculation::getInstance()->calculateFormula($r2Formula).'<br />';

		$callEndTime = microtime(true);

		$callTime = $callEndTime - $callStartTime;



		echo '<hr />Call time for Quadratic Equation Solution was '.sprintf('%.4f',$callTime).' seconds<br /><hr />';

		echo ' Peak memory usage: '.(memory_get_peak_usage(true) / 1024 / 1024).' MB<br />';

	}

}



?>



</body>

<html>

