color:#000000;'>.</span></b> <b><span style='color:#000000;'>if</span></b> n == <span style='color:#b08000;'>0</span> <b><span style='color:#000000;'>then</span></b> <span style='color:#b08000;'>1</span> <b><span style='color:#000000;'>else</span></b> n * factorial (n - <span style='color:#b08000;'>1</span>);

print &lt;&lt; factorial <span style='color:#b08000;'>5</span>; <i><span style='color:#898887;'>// prints 120</span></i>
print &lt;&lt; <b><span style='color:#bf0303;'>'</span></b><span style='color:#