From: exploringbinary at gmail dot com
Operating system: Windows
PHP version: 5.2.8
PHP Bug Type: Math related
Bug description: printf of floating point variable prints maximum of 40
decimal places
Description:
------------
printf will not print more than 40 decimal places, even if the format
specifier asks for more. For example,
<?php
$value = 0.00000000000000011102230246251565404236316680908203125; //
2^-53
printf ("%1.53f",$value); // Prints only 40 decimal places:
0.0000000000000001110223024625156540423632
?>
Contrast this with javascript:
<script type="text/javascript">
var value = 0.00000000000000011102230246251565404236316680908203125; //
2^-53
var result = value.toFixed(53);
document.write (result); // Prints all 53 decimal places
</script>
I reported a similar bug in Visual Studio, which Microsoft acknowledged as
an error:
https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=329278
Reproduce code:
---------------
<?php
$value = 0.00000000000000011102230246251565404236316680908203125; //
2^-53
printf ("%1.53f",$value); // Prints only 40 decimal places:
0.0000000000000001110223024625156540423632
?>
Expected result:
----------------
I expect to see all 53 decimal places printed:
0.00000000000000011102230246251565404236316680908203125
Actual result:
--------------
Only 40 decimal places are printed:
0.0000000000000001110223024625156540423632
--
Edit bug report at http://bugs.php.net/?id=47168&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=47168&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=47168&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=47168&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=47168&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=47168&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=47168&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=47168&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=47168&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=47168&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=47168&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=47168&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=47168&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=47168&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=47168&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47168&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=47168&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=47168&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=47168&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=47168&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=47168&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=47168&r=mysqlcfg
