-#define LEN(x) (sizeof (x) / sizeof (x[0]))
-#define MAX(x,y) ((x)>(y)?(x):(y))
-#define MIN(x,y) ((x)<(y)?(x):(y))
+#define LEN(x) (sizeof (x) / sizeof (x[0]))
+#define MAX(x,y) ((x)>(y)?(x):(y))
+#define MIN(x,y) ((x)<(y)?(x):(y))
+#define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))