Class, Object, methods

<?php
class Calculation
{
    public $a, $b, $c;

    function sum()
    {
        $this -> c = $this -> a + $this -> b;
        return $this -> c;
    }
    function sub()
    {
        $this -> c = $this -> a - $this -> b;
        return $this -> c;
    }
}
$c1 = new Calculation();
$c1 -> a = 20;
$c1 -> b = 40;

$c2 = new Calculation();
$c2 -> a = 10;
$c2 -> b = 80;

echo "Addition is : " . $c1 -> sum();
echo "<br>";
echo "Sum is : " . $c2 -> sum();
echo "<br>";
echo "Sub is : " . $c1 -> sub();
echo "<br>";
echo "Subtraction is : " . $c2 -> sub();

//  OUTPUT:
// Addition is : 60
// Sum is : 90
// Sub is : -20
// Subtraction is : -70

?>

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