一次性写出C++中的所有关键字，有人会问了，到底有几个呢？ 下面来数数吧！
asm do if return try auto double inline short typedef bool dynamic_cast int signed typeid break else long static union case enum mutable static_cast unsigned catch explicit namespace struct using char export new switch virtual class extern register sizeof typename const false operator template void const_cast float private this volatile continue for protected throw wchar_t default friend public true while delete goto reinterpret_cast