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C Keywords Rule and Guidelines for Naming Variables

A keyword is a reserved word. You cannot use in variable name, constant name, etc. There are 32 keywords in the C language.

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

For example:

Next TopicIdentifiers in C

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