Reserved and Predefined Words

Table 6-1 shows all reserved keywords in C++ and C, plus keywords that are predefined by C++. Keywords that are reserved in C++ but not in C are shown in boldface.

Table 6-1 Reserved Keywords

asm	do	if	return	typedef
auto	double	inline	short	typeid
bool	dynamic_cast	int	signed	typename
break	else	long	sizeof	union
case	enum	mutable	static	unsigned
catch	explicit	namespace	static_cast	using
char	export	new	struct	virtual
class	extern	operator	switch	void
const	false	private	template	volatile
const_cast	float	protected	this	wchar_t
continue	for	public	throw	while
default	friend	register	true
delete	goto	reinterpret_cast	try

_ _STDC_ _ is predefined to the value 0. For example:

---

#include <stdio.h>
main()
{
    #ifdef __STDC__
        printf("yes\n");
    #else
        printf("no\n");
    #endif

    #if    __STDC__ ==0
        printf("yes\n");
    #else
        printf("no\n");
    #endif
}

---

produces:

---

yes
yes

---

The following table lists reserved words for alternate representations of certain operators and punctuators specified in the current ANSI/ISO working paper from the ISO C++ Standards Committee. These alternate representations have not yet been implemented in the C++ compiler, but in future releases may be adopted as reserved words and should not be otherwise used.

Table 6-2 Reserved Words for Operators and Punctuators

and	bitor	not	or	xor
and_eq	compl	not_eq	or_eq	xor_eq
bitand