<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 . '../Classes/');

?>

<h1>Quadratic Equation Solver</h1>

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

Enter the coefficients for the Ax² + 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>