44 lines
2.0 KiB
PHP
44 lines
2.0 KiB
PHP
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<?php
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use PhpOffice\PhpSpreadsheet\Calculation;
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require __DIR__ . '/../Header.php';
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?>
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<form action="45_Quadratic_equation_solver.php" method="POST">
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Enter the coefficients for the Ax<sup>2</sup> + Bx + C = 0
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<table border="0" cellpadding="0" cellspacing="0">
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<tr><td><b>A </b></td>
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<td><input name="A" type="text" size="8" value="<?php echo (isset($_POST['A'])) ? htmlentities($_POST['A']) : ''; ?>"></td>
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</tr>
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<tr><td><b>B </b></td>
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<td><input name="B" type="text" size="8" value="<?php echo (isset($_POST['B'])) ? htmlentities($_POST['B']) : ''; ?>"></td>
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</tr>
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<tr><td><b>C </b></td>
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<td><input name="C" type="text" size="8" value="<?php echo (isset($_POST['C'])) ? htmlentities($_POST['C']) : ''; ?>"></td>
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</tr>
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</table>
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<input name="submit" type="submit" value="calculate"><br />
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If A=0, the equation is not quadratic.
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</form>
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<?php
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/** If the user has submitted the form, then we need to execute a calculation * */
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if (isset($_POST['submit'])) {
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if ($_POST['A'] == 0) {
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$helper->log('The equation is not quadratic');
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} else {
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/* Calculate and Display the results * */
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$helper->log('<hr /><b>Roots:</b><br />');
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$discriminantFormula = '=POWER(' . $_POST['B'] . ',2) - (4 * ' . $_POST['A'] . ' * ' . $_POST['C'] . ')';
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$discriminant = Calculation::getInstance()->calculateFormula($discriminantFormula);
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$r1Formula = '=IMDIV(IMSUM(-' . $_POST['B'] . ',IMSQRT(' . $discriminant . ')),2 * ' . $_POST['A'] . ')';
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$r2Formula = '=IF(' . $discriminant . '=0,"Only one root",IMDIV(IMSUB(-' . $_POST['B'] . ',IMSQRT(' . $discriminant . ')),2 * ' . $_POST['A'] . '))';
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$helper->log(Calculation::getInstance()->calculateFormula($r1Formula));
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$helper->log(Calculation::getInstance()->calculateFormula($r2Formula));
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$callEndTime = microtime(true);
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$helper->logEndingNotes();
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}
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}
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