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<?php class factorial_of_a_number{ protected $n; public function __construct($n){ if(!is_int($n)){ throw new InvalidArgumentException('Not A Number or missing argument'); } $this->n = $n; } public function result(){ $factorial = 1; for($i=1; $i<= $this ->n;$i++){ $factorial *= $i; } return $factorial; } } $newfactorial = new factorial_of_a_number(3); echo $newfactorial->result();
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