(C++) GetFactorialTerms

 

Math code snippet to obtain the product terms of a factorial. One can use this approach with DivideTerms to calculate the division of large factorials.

 

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#include <algorithm #include <functional> #include <numeric> #include <vector> //From http://www.richelbilderbeek.nl/CppFunctorIncrease.htm struct Increase : public std::unary_function<void,int> {   explicit Increase(const int& initValue = 0) : mValue(initValue) {}   void operator()(int& anything)   {     anything = mValue;     ++mValue;   }   private:   int mValue; }; //From http://www.richelbilderbeek.nl/CppGetFactorialTerms.htm const std::vector<int> GetFactorialTerms(const int n) {   std::vector<int> v(n);   std::for_each(v.begin(), v.end(),Increase(1));   return v; }