<?php




if($_GET['num1_dive'] > 0  and $_GET['num1_time'] > 0  and $_GET['num1_take'] > 0 and $_GET['num1_add'] > 0 )
{
$num1_add = $_GET['num1_add'];
$num2_add = $_GET['num2_add'];
$total1 = $num1_add + $num2_add;

$num1_take = $_GET['num1_take'];
$num2_take = $_GET['num2_take'];
$total2 = $num1_take - $num2_take;

$num1_time = $_GET['num1_time'];
$num2_time = $_GET['num2_time'];
$total3 = $num1_time * $num2_time;

$num1_dive = $_GET['num1_dive'];
$num2_dive = $_GET['num2_dive'];
$total4 = $num1_dive / $num2_dive;
echo "1.) $total1 <br>";
echo "2.) $total2 <br>";
echo "3.) $total3 <br>";
echo "4.) $total4 <br>";
echo '<a href="index.html">click here to go back</a>';


}
else
{

echo "You did not enter a vaild value<br>";
echo '<a href="index.html">click here to go back</a>';
}








?>