#include "lib9.h"#include "mathi.h" doublefdim(double x, double y){	if(x>y)		return x-y;	else		return 0;} doublefmax(double x, double y){	if(x>y)		return x;	else		return y;} doublefmin(double x, double y){	if(x<y)		return x;	else		return y;}