abnormal behavior of php code!

[reimei]

Hello

I'm confused with the behavior of the following code:

$t = 9.8;
$deltaT = 0.1;
while($t < 10)
{
    $t = $t+ $deltaT;
    echo $t.'<br />';
}

For $t = 9.8, it echos the correct result(the last number it echos is 10), but for $t smaller than 9.8, for example $t = 9.5, the last number it echos is 10.1.

why?!

Edited October 20, 2013 by reimei

[Ch0cu3r]

Read the following (red warning)

http://php.net/manual/en/language.types.float.php

Edited October 20, 2013 by Ch0cu3r

[reimei]

You taught me a new thing.

Thanks alot

Edited October 20, 2013 by reimei