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Bug #31180 4.3.10 printf(%.2f) precision bug.
Submitted: 2004-12-18 12:18 UTC Modified: 2004-12-19 21:06 UTC
Votes:1
Avg. Score:4.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (100.0%)
From: patrick at ilmander dot com Assigned:
Status: Not a bug Package: Unknown/Other Function
PHP Version: 4.3.10 OS: Red Hat Linux
Private report: No CVE-ID: None
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From: patrick at ilmander dot com
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 [2004-12-18 12:18 UTC] patrick at ilmander dot com 
Description:
------------
Printing a variable with %.2f should output the number with 2 decimals. After upgrading to 4.3.10 it now outputs 3 decimals. %.1f outputs with 2 decimals and I haven't figured out how to print out just 1 decimal (%.1f doesn't work), so I'm treating this as a bug.

Reproduce code:
---------------
printf("%.2f", $member[score] / $member[votes]);

Expected result:
----------------
1.23

Actual result:
--------------
1.234

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 [2004-12-18 12:20 UTC] patrick at ilmander dot com 
Printing a variable with %.2f should output the number with 2 decimals. After upgrading to 4.3.10 it now outputs 3 decimals. %.1f outputs with 2 decimals and I haven't figured out how to print out just 1 decimal (%.0f doesn't work), so I'm treating this as a bug.
 [2004-12-18 23:43 UTC] derick@php.net 
This works fine here:

$ php-4.3dev -r 'echo sprintf("%.2f", 42.1231213123);'

42.12
 [2004-12-19 16:54 UTC] postings-php-bug at hans-spath dot de 
I've tried it under PHP 4.3.10/Linux 2.6 and PHP 4.3.8/WinXPsp2, works as it should.

Could you test with "_%.2f_", just to get sure the last digit isn't coming from somewhere else in your code?
 [2004-12-19 19:18 UTC] iliaa@php.net 
works fine.
 [2004-12-19 21:06 UTC] patrick at ilmander dot com 
I'm sorry, I should have given you more details. The problem doesn't seem to be printf() itself, but where I used it. I was using the following code:
"Rating: <b><?=printf("%.2f", $rating)?></b>"
which worked fine in 4.3.4, but when we upgraded to 4.3.10 it produced the stated error. I've updated all my code to
"Rating: <b><?php printf("%.2f", $rating)?></b>"
which works fine. I probably shouldn't have used printf() inside a <?= ?> in the first place, but it worked fine in 4.3.4 and not in 4.3.10, that's why I reported it as a bug.

Sorry for wasting your time.

// Patrick
 
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