C/math.h/lgamma
lgamma: computes the absolute value of the gamma and returns its natural logarithm
//Declaration: float lgammaf(float arg);
double lgamma(double arg);
long double lgammal(long double arg);
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%f", lgammaf (1.2));
return 0;
}
/*
-0.085374*/