Bug #52324 [Bgs]: bad result when adding two floats
Edit report at http://bugs.php.net/bug.php?id=52324edit=1
ID: 52324
User updated by: brunog at micro-examples dot com
Reported by: brunog at micro-examples dot com
Summary: bad result when adding two floats
Status: Bogus
Type: Bug
Package: *General Issues
Operating System: ubuntu
PHP Version: 5.2.14RC2
New Comment:
thank you for the quick reply
adding ini_set('precision',16); does not give correct result value :
0.0
is it an echo() bug ?
0.0: is lexicographically before 0.1
0.09 + 0.01 = 0.0: is correct ascii saying
Previous Comments:
[2010-07-13 00:39:21] ras...@php.net
prints 0.1 for me. You are probably hitting a floating point limitation
combined
with a precision setting problem in your environment. Try adding
ini_set('precision',16); to the top of your script and you will see.
[2010-07-13 00:35:04] brunog at micro-examples dot com
Description:
PHP Version = 5.2.4-2ubuntu5.10
can you please consider this short code ?
Test script:
---
?php
$f1 = 0.09 ;
$f2 = 0.01 ;
$tot = $f1 + $f2 ;
echo($tot\n) ;
?
Expected result:
0.1
Actual result:
--
0.0:
--
Edit this bug report at http://bugs.php.net/bug.php?id=52324edit=1
Bug #52324 [Bgs]: bad result when adding two floats
Edit report at http://bugs.php.net/bug.php?id=52324edit=1
ID: 52324
Updated by: ras...@php.net
Reported by: brunog at micro-examples dot com
Summary: bad result when adding two floats
Status: Bogus
Type: Bug
Package: *General Issues
Operating System: ubuntu
PHP Version: 5.2.14RC2
New Comment:
That is the correct value according to how computers store floating
point
values. If you want it accurate to 2 decimal places, round() it to 2
decimal
places. Read the big red warning box here:
http://php.net/manual/en/language.types.float.php
Previous Comments:
[2010-07-13 00:58:02] brunog at micro-examples dot com
thank you for the quick reply
adding ini_set('precision',16); does not give correct result value :
0.0
is it an echo() bug ?
0.0: is lexicographically before 0.1
0.09 + 0.01 = 0.0: is correct ascii saying
[2010-07-13 00:39:21] ras...@php.net
prints 0.1 for me. You are probably hitting a floating point limitation
combined
with a precision setting problem in your environment. Try adding
ini_set('precision',16); to the top of your script and you will see.
[2010-07-13 00:35:04] brunog at micro-examples dot com
Description:
PHP Version = 5.2.4-2ubuntu5.10
can you please consider this short code ?
Test script:
---
?php
$f1 = 0.09 ;
$f2 = 0.01 ;
$tot = $f1 + $f2 ;
echo($tot\n) ;
?
Expected result:
0.1
Actual result:
--
0.0:
--
Edit this bug report at http://bugs.php.net/bug.php?id=52324edit=1
Bug #52324 [Bgs]: bad result when adding two floats
Edit report at http://bugs.php.net/bug.php?id=52324edit=1
ID: 52324
User updated by: brunog at micro-examples dot com
Reported by: brunog at micro-examples dot com
Summary: bad result when adding two floats
Status: Bogus
Type: Bug
Package: *General Issues
Operating System: ubuntu
PHP Version: 5.2.14RC2
New Comment:
maybe, but 0.0: is not a correct value at all as an add result, whatever
floating point accuracy is
0.09 + 0.02 gives 0.11 as expected, neither 0.1099 nor 0.::
Previous Comments:
[2010-07-13 01:04:36] ras...@php.net
That is the correct value according to how computers store floating
point
values. If you want it accurate to 2 decimal places, round() it to 2
decimal
places. Read the big red warning box here:
http://php.net/manual/en/language.types.float.php
[2010-07-13 00:58:02] brunog at micro-examples dot com
thank you for the quick reply
adding ini_set('precision',16); does not give correct result value :
0.0
is it an echo() bug ?
0.0: is lexicographically before 0.1
0.09 + 0.01 = 0.0: is correct ascii saying
[2010-07-13 00:39:21] ras...@php.net
prints 0.1 for me. You are probably hitting a floating point limitation
combined
with a precision setting problem in your environment. Try adding
ini_set('precision',16); to the top of your script and you will see.
[2010-07-13 00:35:04] brunog at micro-examples dot com
Description:
PHP Version = 5.2.4-2ubuntu5.10
can you please consider this short code ?
Test script:
---
?php
$f1 = 0.09 ;
$f2 = 0.01 ;
$tot = $f1 + $f2 ;
echo($tot\n) ;
?
Expected result:
0.1
Actual result:
--
0.0:
--
Edit this bug report at http://bugs.php.net/bug.php?id=52324edit=1
Bug #52324 [Bgs]: bad result when adding two floats
Edit report at http://bugs.php.net/bug.php?id=52324edit=1
ID: 52324
Updated by: ras...@php.net
Reported by: brunog at micro-examples dot com
Summary: bad result when adding two floats
Status: Bogus
Type: Bug
Package: *General Issues
Operating System: ubuntu
PHP Version: 5.2.14RC2
New Comment:
It doesn't show 0.0 on any PHP version I have access to. No idea about
your
5.2.4. That's from 3 years ago. I don't have anything that old on any
of my
machines.
Previous Comments:
[2010-07-13 01:10:58] brunog at micro-examples dot com
maybe, but 0.0: is not a correct value at all as an add result, whatever
floating point accuracy is
0.09 + 0.02 gives 0.11 as expected, neither 0.1099 nor 0.::
[2010-07-13 01:04:36] ras...@php.net
That is the correct value according to how computers store floating
point
values. If you want it accurate to 2 decimal places, round() it to 2
decimal
places. Read the big red warning box here:
http://php.net/manual/en/language.types.float.php
[2010-07-13 00:58:02] brunog at micro-examples dot com
thank you for the quick reply
adding ini_set('precision',16); does not give correct result value :
0.0
is it an echo() bug ?
0.0: is lexicographically before 0.1
0.09 + 0.01 = 0.0: is correct ascii saying
[2010-07-13 00:39:21] ras...@php.net
prints 0.1 for me. You are probably hitting a floating point limitation
combined
with a precision setting problem in your environment. Try adding
ini_set('precision',16); to the top of your script and you will see.
[2010-07-13 00:35:04] brunog at micro-examples dot com
Description:
PHP Version = 5.2.4-2ubuntu5.10
can you please consider this short code ?
Test script:
---
?php
$f1 = 0.09 ;
$f2 = 0.01 ;
$tot = $f1 + $f2 ;
echo($tot\n) ;
?
Expected result:
0.1
Actual result:
--
0.0:
--
Edit this bug report at http://bugs.php.net/bug.php?id=52324edit=1
Bug #52324 [Bgs]: bad result when adding two floats
Edit report at http://bugs.php.net/bug.php?id=52324edit=1
ID: 52324
User updated by: brunog at micro-examples dot com
Reported by: brunog at micro-examples dot com
Summary: bad result when adding two floats
Status: Bogus
Type: Bug
Package: *General Issues
Operating System: ubuntu
PHP Version: 5.2.14RC2
New Comment:
strangely it works fine on an older php version
PHP Version = 5.1.6
gives 0.1 as expected
Previous Comments:
[2010-07-13 01:16:39] ras...@php.net
It doesn't show 0.0 on any PHP version I have access to. No idea about
your
5.2.4. That's from 3 years ago. I don't have anything that old on any
of my
machines.
[2010-07-13 01:10:58] brunog at micro-examples dot com
maybe, but 0.0: is not a correct value at all as an add result, whatever
floating point accuracy is
0.09 + 0.02 gives 0.11 as expected, neither 0.1099 nor 0.::
[2010-07-13 01:04:36] ras...@php.net
That is the correct value according to how computers store floating
point
values. If you want it accurate to 2 decimal places, round() it to 2
decimal
places. Read the big red warning box here:
http://php.net/manual/en/language.types.float.php
[2010-07-13 00:58:02] brunog at micro-examples dot com
thank you for the quick reply
adding ini_set('precision',16); does not give correct result value :
0.0
is it an echo() bug ?
0.0: is lexicographically before 0.1
0.09 + 0.01 = 0.0: is correct ascii saying
[2010-07-13 00:39:21] ras...@php.net
prints 0.1 for me. You are probably hitting a floating point limitation
combined
with a precision setting problem in your environment. Try adding
ini_set('precision',16); to the top of your script and you will see.
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/bug.php?id=52324
--
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