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I'm working on a programming language, and today I got the point where I could compile the factorial function(recursive), however due to the maximum size of an integer the largest I can get is factorial(12). What are some techniques for handling integers of an arbitrary maximum size. The language currently works by translating code to C++.
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If you want to roll your own arbitrary precision library, see Knuth's Seminumerical Algorithms, volume 2 of his magnum opus.