}

 

 

 

function sub()

 

 

 

{

 

 

 

$sub=$this->a-$this->b;

 

 

 

echo "<br> sub of a and b is:".$sub;

 

 

 

}

 

 

 

}

 

 

 

$object1 = new ArithmaticOperation();

 

 

 

$object1->add();

 

 

 

$object1->sub();

 

 

 

unset($object1);

 

 

 

?>