PHP 4.0 Bug #9292: Odd behavior adding negative numbers.

From: jdj@darkside.dynup.net Operating system: Linux, *BSD, no clue about win32 PHP version: 4.0.4pl1 PHP Bug Type: Math related Bug description: Odd behavior adding negative numbers. Ok guys.. I've looked everywhere and cannot find an explanation for this behavior. Could you guys explain it? :) This script returns the same thing on 4.0.4p1 and 4.0.3p1. /* Anything less than 3.2/-0.32 exhibits this behavior. Anything above it doesn't */ $x = 0.1 * 3.2; $y = -0.32; print("$x\t$y\n\n"); $a = $x - $y; $b = $x + $y; print("$a\t$b\n"); I can increase the 3.2 and the -0.32 and the return is sane.. everything I've tried below 3.2 returns this oddity. Output from above script.. 0.32 -0.32 0.64 5.5511151231258E-17 Any clues? -- Edit Bug report at: http://bugs.php.net/?id=9292&edit=1