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C keywords: default

From cppreference.net

< c ‎ | keyword

alignas (C23)
alignof (C23)
auto
bool (C23)
break
case
char
const
constexpr (C23)
continue
default
do
double
else
enum

extern
false (C23)
float
for
goto
if
inline (C99)
int
long
nullptr (C23)
register
restrict (C99)
return
short
signed

sizeof
static
static_assert (C23)
struct
switch
thread_local (C23)
true (C23)
typedef
typeof (C23)
typeof_unqual (C23)
union
unsigned
void
volatile
while

_Alignas ( C11* )
_Alignof ( C11* )
_Atomic (C11)
_BigInt (C23)
_Bool ( C99* )
_Complex (C99)
_Decimal128 (C23)
_Decimal32 (C23)
_Decimal64 (C23)
_Generic (C11)
_Imaginary (C99)
_Noreturn ( C11* )
_Static_assert ( C11* )
_Thread_local ( C11* )

conditionally-supported

用法

switch statement ：作为默认 case 标签的声明

类型泛型表达式：作为默认泛型关联的声明

(C11 起)