#include <math.h>float gammln(float xx){	double x,y,tmp,ser;	static double cof[6]={76.18009172947146,-86.50532032941677,		24.01409824083091,-1.231739572450155,		0.1208650973866179e-2,-0.5395239384953e-5};	int j;	y=x=xx;	tmp=x+5.5;	tmp -= (x+0.5)*log(tmp);	ser=1.000000000190015;	for (j=0;j<=5;j++) ser += cof[j]/++y;	return -tmp+log(2.5066282746310005*ser/x);}