adding numbers in php

[Sander Peters]

Hi,

I have the following situation:

$a=5.6000;
$b=8.9000;
$c=($a+$b);

echo $c;

I will get the value '14.5' back from PHP.
Wich is logical.
But what I want is to get the value '14.5000'.
Is there somehow a workaround to let PHP print 4 decimals?

Thanks in advance for your reaktion.

Sander Peters
The Netherlands

[Ewoud Dronkert]

Re: adding numbers in php

Sander Peters wrote:[color=blue]
> Is there somehow a workaround to let PHP print 4 decimals?[/color]

http://www.php.net/download-docs.php

--
E. Dronkert

[Justin Koivisto]

Re: adding numbers in php

Sander Peters wrote:[color=blue]
> Hi,
>
> I have the following situation:
>
> $a=5.6000;
> $b=8.9000;
> $c=($a+$b);
>
> echo $c;
>
> I will get the value '14.5' back from PHP.
> Wich is logical.
> But what I want is to get the value '14.5000'.
> Is there somehow a workaround to let PHP print 4 decimals?
>
> Thanks in advance for your reaktion.
>
> Sander Peters
> The Netherlands
>
>[/color]

printf('%.4f',$ c)

--
Justin Koivisto, ZCE - justin@koivi.co m

http://koivi.com

[Tim Roberts]

Re: adding numbers in php

"Sander Peters" <sanderpeters@y ahoo.com> wrote:[color=blue]
>
>I have the following situation:
>
>$a=5.6000;
>$b=8.9000;
>$c=($a+$b);
>
>echo $c;
>
>I will get the value '14.5' back from PHP.[/color]

Maybe. I'm sure you will shortly be coming up against the NEXT surprising
truth about floating point values, and that is that 5.6 and 8.9 cannot be
represented exactly in binary. Just like trying to represent 1/3 in
decimal, values like 5.6 and 8.9 requires an infinite number of bits. So,
the value you actually get is only an approximation.

Because of that, 5.6 + 8.9 does not actually equal 14.5 (which CAN be
represented exactly in binary). It will PRINT as 14.5, because printing
rounds it, but if you do this:

if( $c == 14.5 )
echo "yes"

it will not actually print "yes".
--
- Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

[Sander Peters]

Re: adding numbers in php


"Justin Koivisto" <justin@koivi.c om> schreef in bericht
news:aOOdnbMi-5XIF8LeRVn-iQ@onvoy.com...[color=blue]
> Sander Peters wrote:[color=green]
>> Hi,
>>
>> I have the following situation:
>>
>> $a=5.6000;
>> $b=8.9000;
>> $c=($a+$b);
>>
>> echo $c;
>>
>> I will get the value '14.5' back from PHP.
>> Wich is logical.
>> But what I want is to get the value '14.5000'.
>> Is there somehow a workaround to let PHP print 4 decimals?
>>
>> Thanks in advance for your reaktion.
>>
>> Sander Peters
>> The Netherlands[/color]
>
> printf('%.4f',$ c)
>
> --
> Justin Koivisto, ZCE - justin@koivi.co m
> http://koivi.com[/color]

Thanks a lot!