Question

关键字是组成编程语言词汇表的标识符，它们不能用于其他用途，如用作变量名。表 B.1 列出了 C++关键字，其中以粗体显示的关键字也是 ANSI C99 标准中的关键字，而以斜体显示的关键字是 C++11 新增的。

表 B.1 C++关键字

alignas	alignof	asm	auto	bool
break	case	catch	char	char16_t
char32_t	class	const	const_cast	constexpr
continue	decltype	default	delete	do
double	dynamic_cast	else	enum	explicit
export	extern	false	float	for
friend	goto	if	inline	int
long	mutable	namespace	new	noexcept
nullptr	operator	private	protected	public
register	reinterpret_cast	return	short	signed
sizeof	static	static_assert	static_cast	struct
switch	template	this	thread_local	throw
true	try	typedef	typeid	typename
union	unsigned	using	virtual	void
volatile	wchar_t	while