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1
28th March 03:40
External User
Posts: 1
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#34427 : round function bug
From: lukasz at knasiecki dot com
Operating system: Windows XP PHP version: 5.0.5 PHP Bug Type: *Math Functions Bug description: round function bug Description: ------------ Round function works with errors. Reproduce code: --------------- echo '<br>'.round(8.055, 2); echo '<br>'.round(8.155, 2); echo '<br>'.round(8.255, 2); Expected result: ---------------- echo '<br>'.round(8.055, 2); //gives 8.06 echo '<br>'.round(8.155, 2); //gives 8.16 echo '<br>'.round(8.255, 2); //gives 8.26 Actual result: -------------- echo '<br>'.round(8.055, 2); //gives 8.06 echo '<br>'.round(8.155, 2); //gives 8.15 !!! echo '<br>'.round(8.255, 2); //gives 8.26 -- Edit bug report at http://bugs.php.net/?id=34427&edit=1 -- Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=34427&r=trysnapshot4 Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=34427&r=trysnapshot50 Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=34427&r=trysnapshot51 Fixed in CVS: http://bugs.php.net/fix.php?id=34427&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=34427&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=34427&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=34427&r=needscript Try newer version: http://bugs.php.net/fix.php?id=34427&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=34427&r=support Expected behavior: http://bugs.php.net/fix.php?id=34427&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=34427&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=34427&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=34427&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=34427&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=34427&r=dst IIS Stability: http://bugs.php.net/fix.php?id=34427&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=34427&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=34427&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=34427&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=34427&r=mysqlcfg |
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2
28th March 03:40
External User
Posts: 1
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#34427 : round function bug
ID: 34427
Updated by: tony2001@php.net Reported By: lukasz at knasiecki dot com -Status: Open +Status: Bogus Bug Type: *Math Functions Operating System: Windows XP PHP Version: 5.0.5 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://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. Previous Comments: ------------------------------------------------------------------------ [2005-09-08 14:24:56] lukasz at knasiecki dot com Description: ------------ Round function works with errors. Reproduce code: --------------- echo '<br>'.round(8.055, 2); echo '<br>'.round(8.155, 2); echo '<br>'.round(8.255, 2); Expected result: ---------------- echo '<br>'.round(8.055, 2); //gives 8.06 echo '<br>'.round(8.155, 2); //gives 8.16 echo '<br>'.round(8.255, 2); //gives 8.26 Actual result: -------------- echo '<br>'.round(8.055, 2); //gives 8.06 echo '<br>'.round(8.155, 2); //gives 8.15 !!! echo '<br>'.round(8.255, 2); //gives 8.26 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=34427&edit=1 |
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3
28th March 03:40
External User
Posts: 1
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#34427 : round function bug
ID: 34427
User updated by: lukasz at knasiecki dot com Reported By: lukasz at knasiecki dot com Status: Bogus Bug Type: *Math Functions Operating System: Windows XP PHP Version: 5.0.5 New Comment: Still, I am sure this is a bug. No software I use (Excel, Shopping program) produces such results, like PHP echo '<br>'.round(0.155*1, 2); >> gives 0,16 echo '<br>'.round(8.155*1, 2); >> gives 8,15 Previous Comments: ------------------------------------------------------------------------ [2005-09-08 14:32:09] tony2001@php.net 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://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. ------------------------------------------------------------------------ [2005-09-08 14:24:56] lukasz at knasiecki dot com Description: ------------ Round function works with errors. Reproduce code: --------------- echo '<br>'.round(8.055, 2); echo '<br>'.round(8.155, 2); echo '<br>'.round(8.255, 2); Expected result: ---------------- echo '<br>'.round(8.055, 2); //gives 8.06 echo '<br>'.round(8.155, 2); //gives 8.16 echo '<br>'.round(8.255, 2); //gives 8.26 Actual result: -------------- echo '<br>'.round(8.055, 2); //gives 8.06 echo '<br>'.round(8.155, 2); //gives 8.15 !!! echo '<br>'.round(8.255, 2); //gives 8.26 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=34427&edit=1 |
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