Keywords and identifiers

                                                                   keywords
every c word is classified as either a keyword or an identifier all keyword have fixed meanings and these meanings cannot be changed keywords sever as basic building blocks for program statements
keywords are words whose meaning has already been explained to the c-compiler
the keywords can not used as variable names

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