lgamma

lgamma, lgammaf, lgammal

Defined in header <math.h>
float       lgammaf( float arg );
(1) (since C99)
double      lgamma( double arg );
(2) (since C99)
long double lgammal( long double arg );
(3) (since C99)
Defined in header <tgmath.h>
#define lgamma( a