C 语言中不能作为常量名、变量名或其他标识符名称的保留字

auto else long switch
break enum register typedef
case extern return union
char float short unsigned
const for signed void
continue goto sizeof volatile
default if static while
do int struct _Packed
double _Bool _Complex _Imaginary inline restrict
_Alignas _Alignof _Atomic _Generic _Noreturn
_Static_assert _Thread_local