Bug #80170 [Com]: incorrect floating
Edit report at https://bugs.php.net/bug.php?id=80170&edit=1
ID: 80170
Comment by: wapinet at mail dot ru
Reported by: wapinet at mail dot ru
Summary: incorrect floating
Status: Not a bug
Type: Bug
Package: Math related
PHP Version: 8.0.0beta4
Block user comment: N
Private report: N
New Comment:
i think it mentions to this note https://github.com/php/php-src/blob/php-8.0.0rc1/UPGRADING#L565
and in real life we actually have usually string "24.99" - https://3v4l.org/44JT1
Previous Comments:
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[2020-10-01 18:41:19] girgias@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://www.floating-point-gui.de/
Thank you for your interest in PHP.
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[2020-10-01 18:12:54] wapinet at mail dot ru
Description:
------------
https://3v4l.org/X4I7W
Test script:
---------------
<?php
var_dump(34.99 - 10);
// Output for 8.0.0alpha1 - beta4
// float(24.990000000000002)
// Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.23, 7.4.0 - 7.4.11
// float(24.99)
Expected result:
----------------
24.99
Actual result:
--------------
24.990000000000002
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Edit this bug report at https://bugs.php.net/bug.php?id=80170&edit=1
Thread (4 messages)