reducing decimals

[albert]

Hello,

Doing a simple division, I obtain this number :
0.002409638554216867234458732127677649259567260742 1875
I'd like to have 0.0024 instead.
I know the number_format function but is it the right solution ?
I thought of another solution :

$MyDec = 0.002409638554216867234458732127677649259567260742 1875;
$MyDecOk = round($MyDec * 10000) / 10000 ; # =0.0024

Is there a special function to do so ?

Thanks in advance,

Albert

[Michael Fesser]

..oO(albert)

>Doing a simple division, I obtain this number :
0.00240963855421686723445873212767764925956726074 21875
I'd like to have 0.0024 instead.
I know the number_format function but is it the right solution ?
I thought of another solution :

$MyDec = 0.002409638554216867234458732127677649259567260742 1875;
$MyDecOk = round($MyDec * 10000) / 10000 ; # =0.0024

Is there a special function to do so ?

Have a look at round()'s second parameter ...

Micha

[=?ISO-8859-15?Q?Iv=E1n_S=E1nchez_Ortega?=]

Michael Fesser wrote:

>>Is there a special function to do so ?

Have a look at round()'s second parameter ...

format_number() and sprintf() are also useful, if you just want to hide the
extra decimals when echo()ing the numbers.

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Iván Sánchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-

Orilla: período de tiempo de 60 minutillos.

[albert]

Have a look at round()'s second parameter ...

I tried this :

$MyDec = 0.002409638554216867234458732127677649259567260742 1875;
$MyDecOk = round($MyDec, 4) ;

The trouble is that this data is serialized in a text file afterward.
Even with round($MyDec, 4), I do get 0.0023999999999... in the text file !
I used the number_format function instead.

albert

[Jerry Stuckle]

albert wrote:

>Have a look at round()'s second parameter ...

I tried this :

$MyDec = 0.002409638554216867234458732127677649259567260742 1875;
$MyDecOk = round($MyDec, 4) ;

The trouble is that this data is serialized in a text file afterward.
Even with round($MyDec, 4), I do get 0.0023999999999... in the text file !
I used the number_format function instead.

albert

Yep, that's what happens with floating point numbers. Floating point is
stored in base 2, not base 10. 0.0024 in this format is a repeating
number (similar to 1/3 in decimal) and cannot be represented directly.

But now you're saying that you're storing the number in a text file -
which you didn't before. That's new information. Albert's comment is
right on with the original information you gave. With the new
information, number_format should work fine.

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Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
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[fssm2666]

On Aug 20, 8:18 am, Jerry Stuckle <[e-mail]:

albert wrote:

Have a look at round()'s second parameter ...

I tried this :

$MyDec = 0.002409638554216867234458732127677649259567260742 1875;
$MyDecOk = round($MyDec, 4) ;

The trouble is that this data is serialized in a text file afterward.
Even with round($MyDec, 4), I do get 0.0023999999999... in the text file !
I used the number_format function instead.

albert

Yep, that's what happens with floating point numbers. Floating point is
stored in base 2, not base 10. 0.0024 in this format is a repeating
number (similar to 1/3 in decimal) and cannot be represented directly.

But now you're saying that you're storing the number in a text file -
which you didn't before. That's new information. Albert's comment is
right on with the original information you gave. With the new
information, number_format should work fine.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
[e-mail]
==================- Hide quoted text -

- Show quoted text -

Albert:

Try with the BCDIV() function, with 3 parameters: $number_1,$number_2
and $number_of_decimal

More information at....
http://cl.php.net/manual/en/ref.bc.php
http://cl.php.net/manual/en/function.bcdiv.php

Felipe Silva.