tgamma, tgammaf, tgammal - compute gamma function

Definition	#include <math.h> double tgamma(double x); (C11) float tgammaf(float x); (C11) long double tgammal(long double x); (C11) These functions compute the mathematical gamma function for a given floating-point number x:
Return val.	tgamma(x)	Value of the gamma function if successful.
	HUGE_VAL HUGE_VALF HUGE_VALL	depending on the function type, if the correct value causes an overflow. In addition errno is set to ERANGE (return value is too large).
	HUGE_VAL HUGE_VALF HUGE_VALL	depending on the function type, if x is a non-positive integer. In addition errno is set to EDOM (invalid argument).
See also	lgamma, math.h