PHP Warning: Division by zero -

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i'm learning php , built experimental form-based calculator (also using html & post method) returns values table. calculator functional when enter values , click submit, keep getting 2 "division zero" errors on last line when first run code. can't seem seem find logical solution or explanations when searching here or via google. explanation can provide newb appreciated. 

<?php   error_reporting(e_all ^ e_notice);  //calculate difference in price  $itemqty = $_post['num1'];  $itemcost = $_post['num2'];  $itemsale = $_post['num3'];  $shipmat = $_post['num4'];  $diffprice = $itemsale - $itemcost;  $actual = ($diffprice - $shipmat) * $itemqty;  $diffpricepercent = (($actual * 100) / $itemcost) / $itemqty ;  ?>

you need wrap form processing code in conditional doesn't run when first open page. so:

if($_post['num1'] > 0 && $_post['num2'] > 0 && $_post['num3'] > 0 && $_post['num4'] > 0){    $itemqty = $_post['num1'];   $itemcost = $_post['num2'];   $itemsale = $_post['num3'];   $shipmat = $_post['num4'];    $diffprice = $itemsale - $itemcost;   $actual = ($diffprice - $shipmat) * $itemqty;   $diffpricepercent = (($actual * 100) / $itemcost) / $itemqty ; }

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