From: martinfrompi@yahoo.co.uk   
      
   On Saturday, September 15, 2012 11:02:10 PM UTC+1, TheGunslinger wrote:   
      
   > I want to implement the use of '!' for recognizing and calculating   
   > the factorial of a number, n.   
   >   
   > I am unable to find a reference to this as being a standard call   
   > within C++.   
   >   
   > Is it contained within a specific library? Or do I, instead, need to   
   > implement an my own algorithm for this?   
   >   
   > I cannot believe it is not included in an STL someplace?   
      
   The problem is that even 13! is not guaranteed to fit into a long.  To   
   represent the results of a factorial expression, you are going to need   
   a bignum library; (almost) any bignum library will have a factorial   
   function.   
      
      
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