Problem with multiplying doubles

[christine]

Hello,

I wanted to create a currency translator with PHP.

The code looks like this:
<?php

$faktor=2.95583 ; // a double
$dm = $euro * $faktor; // $euro is a double variable with the
original value
// $dm is a double variable

echo $dm; // prints 10 when $euro is 5

?>

all varables are double, I checked this with the gettype() function
The calculation seems to take only the integers and cuttig off the .9
before calculating

Another example:
echo 5.5*2.2; // prints 10, should be about 11

what can I do if I want to multily doubles to get the correct answer?

I hope anyone can help me!
thanks in advance for your help!

christine

[Jon Kraft]

Re: Problem with multiplying doubles

christine@hutt-edv.de (christine) wrote:
[color=blue]
> $faktor=2.95583 ; // a double
> $dm = $euro * $faktor; // $euro is a double variable with the
> original value
> // $dm is a double variable
>
> echo $dm; // prints 10 when $euro is 5[/color]

No, it prints 14.77915 when $euro is 5
[color=blue]
> Another example:
> echo 5.5*2.2; // prints 10, should be about 11[/color]

No, it prints 12.1, and that's exactly what it should do.

JOn

[Savut]

Re: Problem with multiplying doubles

No it worked for me ...

Savut

"christine" <christine@hu tt-edv.de> wrote in message
news:f17610db.0 311260240.6267a 4f8@posting.goo gle.com...[color=blue]
> Hello,
>
> I wanted to create a currency translator with PHP.
>
> The code looks like this:
> <?php
>
> $faktor=2.95583 ; // a double
> $dm = $euro * $faktor; // $euro is a double variable with the
> original value
> // $dm is a double variable
>
> echo $dm; // prints 10 when $euro is 5
>
> ?>
>
> all varables are double, I checked this with the gettype() function
> The calculation seems to take only the integers and cuttig off the .9
> before calculating
>
> Another example:
> echo 5.5*2.2; // prints 10, should be about 11
>
> what can I do if I want to multily doubles to get the correct answer?
>
> I hope anyone can help me!
> thanks in advance for your help!
>
> christine[/color]

[Pedro Graca]

Re: Problem with multiplying doubles

Jon Kraft wrote:[color=blue]
> christine@hutt-edv.de (christine) wrote:
>[color=green]
>> $faktor=2.95583 ; // a double
>> $dm = $euro * $faktor; // $euro is a double variable with the
>> original value
>> // $dm is a double variable
>>
>> echo $dm; // prints 10 when $euro is 5[/color]
>
> No, it prints 14.77915 when $euro is 5
>[color=green]
>> Another example:
>> echo 5.5*2.2; // prints 10, should be about 11[/color]
>
> No, it prints 12.1, and that's exactly what it should do.
>
> JOn[/color]

$ cat xx.php
<?php
ini_set('precis ion', '2');

$euro = 5;
$faktor = 2.95583;
$dm = $euro * $faktor;

echo "--------\n$dm\n";

echo 5.5*2.2, "\n";
?>

$ php xx.php
--------
15
12



Check your php.ini !
--
--= my mail address only accepts =--
--= Content-Type: text/plain =--
--= Size below 10K =--

[christine]

Re: Problem with multiplying doubles

christine@hutt-edv.de (christine) wrote in message news:<f17610db. 0311260240.6267 a4f8@posting.go ogle.com>...[color=blue]
> Hello,
>
> I wanted to create a currency translator with PHP.
>
> The code looks like this:
> <?php
>
> $faktor=2.95583 ; // a double
> $dm = $euro * $faktor; // $euro is a double variable with the
> original value
> // $dm is a double variable
>
> echo $dm; // prints 10 when $euro is 5
>
> ?>
>
> all varables are double, I checked this with the gettype() function
> The calculation seems to take only the integers and cuttig off the .9
> before calculating
>
> Another example:
> echo 5.5*2.2; // prints 10, should be about 11
>[/color]

I installed PHP 4.3.4 instead of PHP 4.0.0 and now it works.

Thanks for your answers!

christine