#define GOOD 	1
#define BAD 	0
#define FLUID 	0
#define WALL 	1
#define SET_U	2
#define TRUE 	1
#define FALSE 	0
#define rho_0 	1.0
#define u_0 	0.1
#define faktor	1.0
#define eps 	1E-6
#ifndef max
#define max(x,y)	(((x) <= (y)) ? (y) : (x))
#endif
#ifndef min
#define min(x,y)	(((x) >= (y)) ? (y) : (x)) 
#endif
#define abs(x)		(((x) < (0))? -(x) : (x))