Beginning C: From Novice to Professional, Fourth Edition

APPENDIX CReserved Words in C

The words in the following list are keywords in C, so you must not use them for other purposes, such as variable names or function names.

auto	for	struct
break	goto	switch
case	if	typedef
char	inline	union
const	int	unsigned
continue	long	void
default	register	volatile
do	restrict	while
double	return	_Bool
else	short	_Complex
enum	signed	_Imaginary
extern	sizeof
float	static