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 0.000000000000000055511151231258 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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