C/math.h/tgamma
tgamma: returns the gamma function of arg
//Declaration: float tgammaf(float arg);
double tgamma(double arg);
long double tgammal(long double arg);
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%f\n", tgamma (1.2));
return 0;
}
/*0.918169*/