Re: =.='' what wrong ? just simple code, however error.
| From: | Daniel Brown | Date: | Wed, 31 Dec 2008 19:08:13 +0000 |
| Subject: | Re: =.='' what wrong ? just simple code, however error. | ||
| References: | 1 2 3 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-285301@lists.php.net to get a copy of this message | ||
On Wed, Dec 31, 2008 at 11:15, LKSunny <ad@pc86.com> wrote:
> i need accuracy, how to ?
No you don't. Not the level of accuracy Per was mentioning. His
suggestion to round() is what you need. Just adjust the [optional]
second parameter to the number of decimal places you wish to round:
<?php
$credithold = 100;
for($i=1;$i<=1000;$i++){
$credithold -= 0.1;
echo round($credithold,1)."<br />\n";
}
?>
> "Per Jessen" <per@computer.org>
> 撰寫於郵件新聞:gjg4fk$58p$1@saturn.local.net...
> LKSunny wrote:
>
>> <?
>> $credithold = 100;
>> for($i=1;$i<=1000;$i++){
>> $credithold -= 0.1;
>> echo "$credithold<br />";
>> }
>> //i don't know why, when run this code, on 91.3 after expect is 91.2,
>> however......91.200000000001
>> //who can help me ? and tell me why ?
>
> It's a floating point rounding error. If you don't need the accuracy,
> just round it to what you need.
>
>
> /Per Jessen, Zurich
>
>
>
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</Daniel P. Brown>
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