Need Help Displaying Wrong Answers

MjM8082 · September 6, 2011

Right now my application only displays the answers and problems when the user hits the score button. But when the user hits the score button I want my application to only display the problems that the user got wrong in the test. Here is my code for this applicaiton.. it is small and simple, just not sure how to do this?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Lab 5</title>
</head>

<body>
<?php
define ('ROWS', 3);
define ('COLS', 3);
define ('MAX_NUMBER', 12);
date_default_timezone_set('America/New_York');

if (isset($_POST['btn_score']))
{
	//print_r ($_POST);
	$time1 = $_POST['ts'];
	$time1_object = new DateTime($time1);
	$now = new DateTime();
	$time_span = $now->diff($time1_object);

	$minutes = $time_span->format('%i');
	$seconds = $time_span->format('%s');
	$seconds+= $minutes * 60;

	echo "It took $seconds seconds to complete the test<hr />";



	foreach ($_POST as $problem => $answer)
	{
		if ($problem <> "btn_score" && $problem <> "ts")
		{
			//echo "$problem -- $answer <br />";
			$problem = explode('_', $problem);
			$num1 = $problem[2];
			$num2 = $problem[3];

			echo "$num1 * $num2 === $answer <br />";
		}
	}
}







?>

<h1>Lab 5</h1>

<form name="lab5" method="post" action="lab5b.php">
<?php
	$now = new DateTime();
	//echo $now->format('Y-m-d H:i:s');
	echo "<input type='hidden' name='ts' value='" . $now->format('Y-m-d H:i:s') . "'>";
?>
<table border="1" cellspacing="5" cellpadding="5">

<?php


	$no_of_problems = 0;
	for ($row=0; $row<ROWS; $row++)
	{
		echo "<tr>";
		for ($col=0; $col<COLS; $col++)
		{
			$num1 = mt_rand(1,MAX_NUMBER);
			$num2 = mt_rand(1,MAX_NUMBER);

			echo "<td>$num1 * $num2 </td>";
			echo "<td><input type='text' size='2' name=${no_of_problems}_mult_${num1}_${num2}></td>";
			$no_of_problems++;
		}
		echo "</tr>";
	}
	$colspan = 2 * COLS;
	echo "<tr><td colspan=$colspan align='right'><input type='submit' value='Score' name='btn_score'></td></tr>";
?>	
</table>
</form>

</body>
</html>

WebStyles · September 6, 2011

instead of this:

echo "$num1 * $num2 === $answer <br />";

use this:

if($num1 * $num2 != $answer) echo "$num1 * $num2 === $answer <br />";

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Need Help Displaying Wrong Answers

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