Calculate factorials in C#

Question

How can you calculate large factorials using C#? Windows calculator in Win 7 overflows at Factorial (3500). As a programming and mathematical question I am interested in kno

Answer 1

You will probably have to implement your own arbitrary precision numeric type.

There are various approaches. probably not the most efficient, but perhaps the simplest is to have variable length arrays of byte (unsigned char). Each element represents a digit. ideally this would be included in a class, and you can then add a method which let's you multiply the number with another arbitrary precision number. A multiply with a standard C# integer would probably also be a good idea, but a little trickier to implement.