#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <grass/gis.h>

#define	cv(i,j)		cell[i][j]
#define	av(i,j)		a[i][j]
#define	atbv(i,j)	atb[i][j]
#define	IScvNULL(i,j)	G_is_d_null_value(&cv(i,j))
#define	ISatbvNULL(i,j)	G_is_d_null_value(&atbv(i,j))

#define	ZERO		0.0000001


int	check_ready(void);
void	getcells(void);
void	putcells(void);
void	initialize(void);
void	atanb(void);

#ifdef MAIN
#	define	GLOBAL
#else
#	define	GLOBAL	extern
#endif

GLOBAL	char	*mapset,*iname,*oname;
GLOBAL	char	verbose;
GLOBAL	struct	Cell_head	window;
GLOBAL	DCELL	**cell;
GLOBAL	DCELL	**atb,**a;