Bug #66081 [Opn->Nab]: Error with decimals

Edit report at https://bugs.php.net/bug.php?id=66081&edit=1 ID: 66081 Updated by: derick@php.net Reported by: ffernandez at sidetours dot com Summary: Error with decimals -Status: Open +Status: Not a bug Type: Bug Package: Math related Operating System: Windows 7 PHP Version: Irrelevant Block user comment: N Private report: N New Comment: Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is, read this: http://www.floating-point-gui.de/ Thank you for your interest in PHP. . Previous Comments: ------------------------------------------------------------------------ [2013-11-12 16:14:23] ffernandez at sidetours dot com Description: ------------ --- From manual page: http://www.php.net/function.ceil#refsect1-function.ceil-description --- (36.77 * 100) == 3677 ceil(36.77 * 100) == 3678 // Should be 3677 Test script: --------------- <?php echo "(36.77 * 100) == ".(36.77 * 100)."<br />\n"; echo "ceil(36.77 * 100) == ".ceil(36.77 * 100)."<br />\n"; ?> Expected result: ---------------- (36.77 * 100) == 3677 ceil(36.77 * 100) == 3677 Actual result: -------------- ceil(36.77 * 100) == 3678 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=66081&edit=1