Addition game code

[swp001]

I need to make a game that the user puts in an answer. The program shows 5 numbers randomly generated and an answer is submitted and then shows another problem and tells the user if they are correct or incorrect.

Here is my code so far and it is just always printing incorrect answer. Dont know what I am doing wrong...

<?php



if( !isset($_GET['answer']) ) {
$n1 = rand (1, 10);
$n2 = rand (1, 10);
$n3 = rand (1, 10);
$n4 = rand (1, 10);
$n5 = rand (1, 10);
}
else {
   $num = $_GET['start'] > 14 ? $_GET['start'] - 7 : rand(29,99);
}

?>
<?php print "$n1 + $n2 + $n3 + $n4 + $n5 = ?<br/>"; ?>
<form action="" method="GET">
   <input type="text" name="answer" /><br />
   <input type="hidden" name="start" value="<?php print $num; ?>" />
   <input type="submit" value="Submit" /><br />
</form>
<?php
if( isset($_GET['answer']) ) {
   if( $_GET['answer'] == ($_GET['start']) ) {
      print 'Correct answer!';
   } else {
      print 'Incorrect answer.';
   }
}

[sneakyimp]

OK if they haven't provided a value in 'answer' and submitted it, then you prompt them to ask them what n1 + n2 + n3 + n4 + n5 is then you never put the sum of n1-n5 in the form.

If they do enter a value (even the correct one) for n1 + n2 + n3 + n4 + n5 in 'answer' then you generate an entirely different number, $num, and you put that in your form, you neglect to define n1-n5 at all, and then you compare whatever answer they gave to whatever was submitted in $num.

Your logic is just wrong. Try thinking about it a bit harder.