C keywords:
_Decimal64
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auto
break
case
char
const
continue
default
do
double
else
enum
extern
float
for
goto
if
inline
int
long
register
restrict
return
short
signed
sizeof
static
struct
switch
typedef
union
unsigned
void
volatile
while
_Alignas
_Alignof
_Atomic
_Bool
_Complex
_Decimal128
_Decimal32
_Decimal64
_Generic
_Imaginary
_Noreturn
_Static_assert
_Thread_local
preprocessor-specific
_Pragma
conditionally-supported
fortran
asm
Usage
_Decimal64
type
: as the declaration of the type