45_Quadratic_equation_solver.php
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<?php
use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
require __DIR__ . '/../Header.php';
?>
<form action="45_Quadratic_equation_solver.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 </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 </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 </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) {
$helper->log('The equation is not quadratic');
} else {
// Calculate and Display the results
$helper->log('<hr /><b>Roots:</b><br />');
$discriminantFormula = '=POWER(' . $_POST['B'] . ',2) - (4 * ' . $_POST['A'] . ' * ' . $_POST['C'] . ')';
$discriminant = Calculation::getInstance()->calculateFormula($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'] . '))';
$helper->log(Calculation::getInstance()->calculateFormula($r1Formula));
$helper->log(Calculation::getInstance()->calculateFormula($r2Formula));
$callEndTime = microtime(true);
$helper->logEndingNotes();
}
}