Truncate a decimal pointed figure without rounding ...

elyob

How can I get -0.162058 to -0.1 rather than rounding to -0.2?

I know I'm being stupid here, but it's really bugging me. The number before
the decimal point could 0 - 999

Thanks

Jul 17 '05 #1

Pedro Graca

elyob wrote:

How can I get -0.162058 to -0.1 rather than rounding to -0.2?

I know I'm being stupid here, but it's really bugging me. The number before
the decimal point could 0 - 999

Something like this?

<?php
function number_trim($x) {
if ($x<0)
return ceil($x);
else
return floor($x);
}

$x = -0.162058;
echo number_trim($x*10), "\n";
?>

--
..sig

Jul 17 '05 #2

Eric Veltman

Hello,

elyob wrote:

How can I get -0.162058 to -0.1 rather than rounding to -0.2?
I know I'm being stupid here, but it's really bugging me. The number
before the decimal point could 0 - 999

After making a function myself that was just far more complex
than needed, I saw in the user contributed notes of the manual
that someone contributed a suggestion for such function :

jbeardsl [found_at] gte [d0t] net
08-Nov-2002 01:15
I was looking for a truncate function. Not finding one, I wrote my own.
Since it deals with everything as a number, I imagine it's faster than the
alternative of using string functions. HTH...

function truncate ($num, $digits = 0) {

//provide the real number, and the number of
//digits right of the decimal you want to keep.

$shift = pow(10, $digits);
return ((floor($num * $shift)) / $shift);
}

Best regards,

Eric

Jul 17 '05 #3

elyob

"Eric Veltman" <eric@[RemoveThis]veltman.nu> wrote in message
news:vq************@corp.supernews.com...

Hello,

elyob wrote:

How can I get -0.162058 to -0.1 rather than rounding to -0.2?
I know I'm being stupid here, but it's really bugging me. The number
before the decimal point could 0 - 999

After making a function myself that was just far more complex
than needed, I saw in the user contributed notes of the manual
that someone contributed a suggestion for such function :

jbeardsl [found_at] gte [d0t] net
08-Nov-2002 01:15
I was looking for a truncate function. Not finding one, I wrote my own.
Since it deals with everything as a number, I imagine it's faster than the
alternative of using string functions. HTH...

<snip>

Couldn't get this to work. In the end I exploded by the "." and substr'd the
[1]

Thanks for help

Jul 17 '05 #4

elyob

"Pedro Graca" <he****@hotpop.com> wrote in message
news:bo*************@ID-203069.news.uni-berlin.de...

elyob wrote:

How can I get -0.162058 to -0.1 rather than rounding to -0.2?

I know I'm being stupid here, but it's really bugging me. The number before the decimal point could 0 - 999

Something like this?

<?php
function number_trim($x) {
if ($x<0)
return ceil($x);
else
return floor($x);
}

$x = -0.162058;
echo number_trim($x*10), "\n";
?>

Didn't seem to want to work for me ... found a different method (as in other
reply).

Thanks

Jul 17 '05 #5