Need Help With Multiplication App

MjM8082 · September 4, 2011

I have a multiplication app that users will use as a test. The app has 9 multiplication problems that will be filled out. Then when the user hits the score button. It will then display the number of seconds it took to complete test and the answers that were filled out.

What I want this app to do is display the ones that the user got wrong along with the correct answer. Not sure how I would do this.

Here is my code to the app...

<!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

hmmm... just answered the same question in your duplicate post. (you shouldn't do that!!!)

anyway, this one says you want the wrong answers along with what should have been the correct answer... so change this line:

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

to:

if(($num1 * $num2) != $answer) echo "$num1 * $num2 === $answer | Correct answer was: <b>".($num1 * $num2)."</b><br />";

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