isnum
#define isnum(c) (((c) >= '0') && ((c) <= '9'))
#define isnum(c) ((c) >= '0' && (c) <= '9')
#define isnum(c) ((c) >= '0' && (c) <= '9')
#define isnum(c) ((c) >= '0' && (c) <= '9')
#define isnum(c) ((c) >= '0' && (c) <= '9')
#define isnum(c) ((c) >= '0' && (c) <= '9')
#define isnum(c) (((c) >= '0') && ((c) <= '9'))
#define isnum(c) ((c) >= '0' && (c) <= '9')