Integers and doubles?

[fizzwizz]

$sum = ($entry[13] - $entry[10]);
echo $sum;
echo $entry[13];
echo $entry[10];

this echos out 41 49.99 and 8.05 respectively

yet 49.99 - 8.05 isn't 41

what is wrong?

[Anon]

What happens if you do...

printf("%1.2f\n", $sum);

or

printf("%1.2f\n", $entry[13] + $entry[10]);

If you have bcmath enabled, what happens if you do...

$sum = bcadd($entry[13], $entry[10], 2)

Hank