<?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(); } }