Please enter a whole number ... <br />
<b>Warning</b>:  Use of undefined constant STDIN - assumed 'STDIN' (this will throw an Error in a future version of PHP) in <b>/var/www/storage/cdn/libs/ace@1.4.8/demo/kitchen-sink/docs/php.php</b> on line <b>13</b><br />
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Factorial  = 1