#22738 [Opn->Bgs]: Imcrementing by decimals leads to partial failure
| From: | sniper@php.net | Date: | Sun, 16 Mar 2003 22:29:54 +0000 |
| Subject: | #22738 [Opn->Bgs]: Imcrementing by decimals leads to partial failure | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-35716@lists.php.net to get a copy of this message | ||
ID: 22738
Updated by: sniper@php.net
Reported By: sunofman at sympatico dot ca
-Status: Open
+Status: Bogus
Bug Type: Variables related
Operating System: Windows XP
PHP Version: 4.3.1
New Comment:
<?php
ini_set("precision",18);
$x = 0.0;
$y = 0.8;
do {
if ($x == $y) {
PRINT "found\n";
} else {
PRINT "not found\n";
}
$x += 0.1;
echo $x;
} while($x <= 1.0);
?>
Try this and you'll see why..
And then read this to know why that happens:
http://www.php.net/manual/en/language.types.float.php
Previous Comments:
------------------------------------------------------------------------
[2003-03-16 16:00:59] sunofman at sympatico dot ca
$x = 0.0;
$y = 0.7;
do {
if ($x == $y) {
PRINT "found<br>";
} else {
PRINT "not found<br>";
}
$x += 0.1;
} while($x <= 1.0);
When $y is 0.0 to 0.7 everything works fine and it will find the
match...if you make $y = 0.8 or higher it will fail to find the match.
I'm using the basic install of 4.3.1 (it happens in older versions as
well)
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=22738&edit=1