[Resolved] Multiply two numbers

sidsel

As europeans use , (comma) as a decimal seperator how do I multiply two numbers in that format?

Ie. 18,55 * 1,25 = 23,1875

sysera

Here is an example of using pre_replace to strip the , and replace it with "", nothing at all.


$value1 = "18,55";
$value2 = "1,25";

$value1 = preg_replace("|,|","",$value1);
$value2 = preg_replace("|,|","",$value2);

$total = $value1 * $value2;

echo $total;

Minister

Sorry sysera, but this is bullocks!
The outcome of that multiply is totally different then sidsel wants.

Sidsel: Read this and look at the first comment from 'pillepop2003 at yahoo dot de'. I think this is what you want.

sysera

Originally posted by Minister
Sorry sysera, but this is bullocks!
The outcome of that multiply is totally different then sidsel wants.

Sidsel: Read this and look at the first comment from 'pillepop2003 at yahoo dot de'. I think this is what you want.

If I run that code, the result is "231875", which is the same result minus the comma... Maybe I'm missing something here.

Minister

ah ok. and then put the comma in again.
Sorry, yeah that is a possibility. But you must calculate the comma back

sysera

Originally posted by Minister
ah ok. and then put the comma in again.
Sorry, yeah that is a possibility. But you must calculate the comma back

I'm sure number_format in some way would take care of that.

Replace:

echo $total;

With:

echo number_format($total);

laserlight

<?php
function calculate($a, $b, $op) {
	//change commas to periods
	$a = str_replace(',', '.', $a);
	$b = str_replace(',', '.', $b);
	//determine which arithmetic operation to use
	switch ($op) {
	case '+': $ret = $a + $b; break;
	case '-': $ret = $a - $b; break;
	case '*': $ret = $a * $b; break;
	case '/': $ret = $a / $b; break;
	case '%': $ret = fmod($a, $b); break;
	default: return false;
	}
	//change periods back to commas and return
	return str_replace('.', ',', $ret);
}

//calculate 18,55 * 1,25
echo calculate("18,55", "1,25", "*");
?>

Basically, number_format() isnt needed.
All that's being done here is treating the comma as the decimal point.

sysera

Originally posted by laserlight

<?php
function calculate($a, $b, $op) {
	//change commas to periods
	$a = strtr($a, ',', '.');
	$b = strtr($b, ',', '.');
	//determine which arithmetic operation to use
	switch ($op) {
	case '+': $ret = $a + $b; break;
	case '-': $ret = $a - $b; break;
	case '*': $ret = $a * $b; break;
	case '/': $ret = $a / $b; break;
	case '%': $ret = fmod($a, $b); break;
	default: return false;
	}
	//change periods back to commas and return
	return strtr($ret, '.', ',');
}

//calculate18,55 * 1,25
echo calculate("18,55", "1,25", "*");
?>

Basically, number_format() isnt needed.
All that's being done here is treating the comma as the decimal point. [/B]

I dislike you! Hehe, just kidding. That's very nice. 🙂

sidsel

Thanks🙂