[SOLVED] How can i round to the hundreths in a decimal?

[nscherneck]

Hey everyone,

 

First post here.  Im trying to echo the result of a mathematical calculation and would like to round it to the hundredths.  Heres what ive got...

 

<form id="FormName" action="" method="get" name="FormName">

<p>Unit Name: <input type="text" name="UnitName" size="24"></p>

<p>Unit CFM rating: <input type="text" name="CFMRating" size="24"></p>

<p>Duct Diameter (at detector location): <input type="text" name="Diameter" size="24"></p>

<input type="submit" name="submit">

</form>

<?php

if ($Diameter > 0)

$Radius = ($Diameter / 2);

$SquareInch = ($Radius * $Radius * 3.14);

$SquareFeet = ($SquareInch / 144);

$FPM = ($CFMRating / $SquareFeet);

 

echo "<p>At the detector location the duct is <b>$SquareInch</b> square inches, or <b>$SquareFeet</b> square feet.</p>

<p>The air velocity at the detector location is <b>$FPM</b> Feet Per Minute (FPM).</p>";

?>

[willpower]

look up, floor, ceil and number_format in the php manual

[AndyB]

Round - http://ca.php.net/manual/en/function.round.php

 

$rounded = round($var,2);// rounds $var 2 decimal places

[Barand]

Willpower,

 

floor, ceil round to whole numbers - no decimals - not to a specified number of decimal places

[tibberous]

You can still use ceil.

 

echo ceil(($num-.5)*100)/100;

 

How everyone cool does it.

[AndyB]

You can still use ceil.

 

echo ceil(($num-.5)*100)/100;

 

How everyone cool does it.

 

Only if wrong is cool

 

round() is the best function for rounding.

[nscherneck]

excellent, thank you everyone!