2010-09-17 22:46:31 +00:00
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<html>
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<head>
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<title>Quadratic Equation Solver</title>
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</head>
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<body>
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<?php
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/** Error reporting **/
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error_reporting(E_ALL);
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/** Include path **/
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2013-07-10 11:33:04 +00:00
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set_include_path(get_include_path() . PATH_SEPARATOR . dirname(__FILE__) . '/../Classes/');
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2010-09-17 22:46:31 +00:00
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?>
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<h1>Quadratic Equation Solver</h1>
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<form action="Quadratic2.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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echo 'The equation is not quadratic';
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} else {
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/** So we include PHPExcel to perform the calculations **/
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include 'PHPExcel/Calculation.php';
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/** Calculate and Display the results **/
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echo '<hr /><b>Roots:</b><br />';
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$callStartTime = microtime(true);
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$discriminantFormula = '=POWER('.$_POST['B'].',2) - (4 * '.$_POST['A'].' * '.$_POST['C'].')';
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$discriminant = PHPExcel_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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echo PHPExcel_Calculation::getInstance()->calculateFormula($r1Formula).'<br />';
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echo PHPExcel_Calculation::getInstance()->calculateFormula($r2Formula).'<br />';
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$callEndTime = microtime(true);
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$callTime = $callEndTime - $callStartTime;
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echo '<hr />Call time for Quadratic Equation Solution was '.sprintf('%.4f',$callTime).' seconds<br /><hr />';
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echo ' Peak memory usage: '.(memory_get_peak_usage(true) / 1024 / 1024).' MB<br />';
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}
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}
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?>
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</body>
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<html>
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