math - How can I calculate the factorial of a double in c++ -

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i hoping there library function somewhere can this. , yes important factorial of double value (that needs work non-integer values).

the c99 standard library contains gamma function, double tgamma(double). closely related factorial, can define:

#include <cmath>  double factorial(double x) {return std::tgamma(x+1);}

this should available in c++11 implementation, not guaranteed in c++03 implementation, might include c90 library. if implementation doesn't have it, boost.math library does.


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