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Bug #74254 Data judgment problem
Submitted: 2017-03-16 03:40 UTC Modified: 2017-03-16 03:46 UTC
From: 290605830 at qq dot com Assigned:
Status: Not a bug Package: Output Control
PHP Version: 7.0.16 OS: windows 7
Private report: No CVE-ID: None
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 [2017-03-16 03:40 UTC] 290605830 at qq dot com
162.95 multiplied by 100 and not equal to 16295, the other digits tested were normal

Test script:
$a = 162.95;
$b = 16295;

$c = (double)($a*100);
$b = (double)$b;

	echo "<br/>not eq ,c=".$c.",b=".$b;
	echo "eq";

Expected result:
The result of running this script should be equal

Actual result:
Actual results are not equal


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 [2017-03-16 03:46 UTC]
-Status: Open +Status: Not a bug
 [2017-03-16 03:46 UTC]
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:

Thank you for your interest in PHP.

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