problems with rounding

[kryppienation]

Howdy, I am having a problem here with rounding. I cannot seem to figure out what is going on.

 

Here is the code.

 

if($hardnesspicked == Stainless){
	$odpicked = 5;
	$tpi = .953;

	echo 'You have picked stainless steel on the kasto saw, the time per inch will be '.$tpi.'<p>';

	//let's do the math and get the PPH

	$mpp = $odpicked * $tpi;


	echo ''.$mpp.' MPP <p>';


	$mpp = round($mpp, 2);




	echo ''.$mpp.' formatted mpp<p>';



	$pph = 60 / $mpp;

	$pph = round($pph, 3);

	echo 'This Job will have a PPH = '.$pph.'.<p>';

}

 

 

Here is the output:

You have picked stainless steel on the kasto saw, the time per inch will be 0.953

 

4.765 MPP

 

4.76 formatted mpp

 

This Job will have a PPH = 12.605.

 

4.765 should be rounding up to 4.77

 

I cannot figure out what i am doing wrong and why this number is not rounding to 4.77 Can anyone help me figure this out?

[.josh]

$pph = round($pph, 2);

[kryppienation]

ummm.... i need pph to be a 3 point decimal... and had the mpp came out to 4.77 instead of 4.76 my pph would be correct... which should be 12.579 instead of 12.605. The problem is that the round is not taking 4.765 and turning it into 4.77.

[PFMaBiSmAd]

Rounding in pure math rounds to make the next higher digit even. To round 'up' requires code like the following -

 

<?php
$num = 4.765;
$num = ceil($num * 100)/100;
echo $num;
?>

[kryppienation]

You rock my world!! Solved. Thanks a lot PFMaBiSmAd

[PFMaBiSmAd]

Here is a thread with a couple of functions where you can specify the number of digits - http://www.phpfreaks.com/forums/index.php?topic=128753.0

[kryppienation]

I just ran into a problem... if the number to be round is 4.352, this will round the number incorrectly to 4.36.... I need the number to round up if the 3rd decimal place is 5-9 and round down if the third decimal place is 0-4. Any more suggestions?

[sasa]

look

<?php
$num = 4.765;
echo $num,"<br />\n";
echo $num - 4.76; 
?>