/*
 * typedefs.h
 */

typedef struct {
   double x;
   double y;
   double z;
} dvector;		/* double vector structure */

#define SGN(x)		((x)<0.?-1.:1.)
#define MIN(x,y)	((x)<(y)?(x):(y))
#define ABS(x)		((x)<0.?-(x):(x))
#define MINABS(x,y)	(ABS(y)<ABS(x)?(y):(x))
#define SIGN(x,y)	(ABS(x)*SGN(y))
#define MOD(x,y)	((x)-(int)((x)/(y))*(y))