Hi,
can't we make this a FAQ?
(if I get no response, it's in the FAQ in 60 mins :)
Derick
On 22 Feb 2001 [EMAIL PROTECTED] wrote:
ID: 9411
Updated by: lyric
Reported By: [EMAIL PROTECTED]
Old-Status: Closed
Status: Bogus
Old-Bug Type: *Regular Expressions
Bug Type: Math related
Assigned To:
Comments:
This is nothing to do with PHP, its just part of the way computers store
floating-point numbers. It stores an aproximation of 0.32, as close as it can get,
but when you start multiplying it, the little difference between 0.32 and what it
stored starts to get magnified.
BTW, 5.5511151231258E-17 is 0.55511151231258 which is *really*
closed to 0.
If you want to output formatted numbers, you should either round it, or use printf()
http://www.php.net/manual/en/function.printf.php
Previous Comments:
---
[2001-02-22 16:05:47] [EMAIL PROTECTED]
This is normal floating point math behavior
---
[2001-02-22 15:45:55] [EMAIL PROTECTED]
Hi I am not sure if I have found a bug - what do you think...?
Consider this:
$var1 = -0.32 + (0.1*3.2)
This should give var1 the value 0, instead it gives
5.5511151231258E-17
Interestingly if you increase -0.33 and 3.3 respectively it gives the correct
answer. Werid!
Rob Burne
[EMAIL PROTECTED]
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Derick Rethans
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