C/C++关键字整理
本文共整理了C/C++关键字，其中C关键字32个，C++关键字97个。为了方便使用分别使用三种格式梳理。
C 关键字
共收录32个关键字。
关键字 说明
auto 声明自动变量
short 声明短整型变量或函数
int 声明整型变量或函数
long 声明长整型变量或函数
float 声明浮点型变量或函数
double 声明双精度变量或函数
char 声明字符型变量或函数
struct 声明结构体变量或函数
union 声明共用数据类型
enum 声明枚举类型
typedef 用以给数据类型取别名
const 声明只读变量
unsigned 声明无符号类型变量或函数
signed 声明有符号类型变量或函数
extern 声明变量是在其他文件正声明
register 声明寄存器变量
static 声明静态变量
volatile 说明变量在程序执行中可被隐含地改变
void 声明函数无返回值或无参数，声明无类型指针
if 条件语句
else 条件语句否定分支（与 if 连用）
switch 用于开关语句
case 开关语句分支
for 一种循环语句
do 循环语句的循环体
while 循环语句的循环条件
goto 无条件跳转语句
continue 结束当前循环，开始下一轮循环
break 跳出当前循环
default 开关语句中的“其他”分支
sizeof 计算数据类型长度
return 子程序返回语句（可以带参数，也可不带参数）循环条件
- 格式一
"void","char","int","float","double","short","long","signed","unsigned","struct","union","enum","typedef","sizeof","auto","static","register","extern","const","volatile","return","continue","break","goto","if","else","switch","case","default","for","do","while"
- 格式二
"void",
"char",
"int",
"float",
"double",
"short",
"long",
"signed",
"unsigned",
"struct",
"union",
"enum",
"typedef",
"sizeof",
"auto",
"static",
"register",
"extern",
"const",
"volatile",
"return",
"continue",
"break",
"goto",
"if",
"else",
"switch",
"case",
"default",
"for",
"do",
"while",
- 格式三
void,
char,
int,
float,
double,
short,
long,
signed,
unsigned,
struct,
union,
enum,
typedef,
sizeof,
auto,
static,
register,
extern,
const,
volatile,
return,
continue,
break,
goto,
if,
else,
switch,
case,
default,
for,
do,
while,
C++ 关键字
共收录97个C++关键字，
来源： https://www.apiref.com/cpp-zh/cpp/keywords.html
- 格式一
"alignas","alignof","and","and_eq","asm","atomic_cancel","atomic_commit","atomic_noexcept","auto","bitand","bitor","bool","break","case","catch","char","char8_t","char16_t","char32_t","class","compl","concept","const","consteval","constexpr","constinit","const_cast","continue","co_await","co_return","co_yield","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","not","not_eq","nullptr","operator","or","or_eq","private","protected","public","reflexpr","register","reinterpret_cast","requires","return","short","signed","sizeof","static","static_assert","static_cast","struct","switch","synchronized","template","this","thread_local","throw","true","try","typedef","typeid","typename","union","unsigned","using","virtual","void","volatile","wchar_t","while","xor","xor_eq",
- 格式二
"alignas",
"alignof",
"and",
"and_eq",
"asm",
"atomic_cancel",
"atomic_commit",
"atomic_noexcept",
"auto",
"bitand",
"bitor",
"bool",
"break",
"case",
"catch",
"char",
"char8_t",
"char16_t",
"char32_t",
"class",
"compl",
"concept",
"const",
"consteval",
"constexpr",
"constinit",
"const_cast",
"continue",
"co_await",
"co_return",
"co_yield",
"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",
"not",
"not_eq",
"nullptr",
"operator",
"or",
"or_eq",
"private",
"protected",
"public",
"reflexpr",
"register",
"reinterpret_cast",
"requires",
"return",
"short",
"signed",
"sizeof",
"static",
"static_assert",
"static_cast",
"struct",
"switch",
"synchronized",
"template",
"this",
"thread_local",
"throw",
"true",
"try",
"typedef",
"typeid",
"typename",
"union",
"unsigned",
"using",
"virtual",
"void",
"volatile",
"wchar_t",
"while",
"xor",
"xor_eq",
- 格式三
alignas,
alignof,
and,
and_eq,
asm,
atomic_cancel,
atomic_commit,
atomic_noexcept,
auto,
bitand,
bitor,
bool,
break,
case,
catch,
char,
char8_t,
char16_t,
char32_t,
class,
compl,
concept,
const,
consteval,
constexpr,
constinit,
const_cast,
continue,
co_await,
co_return,
co_yield,
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,
not,
not_eq,
nullptr,
operator,
or,
or_eq,
private,
protected,
public,
reflexpr,
register,
reinterpret_cast,
requires,
return,
short,
signed,
sizeof,
static,
static_assert,
static_cast,
struct,
switch,
synchronized,
template,
this,
thread_local,
throw,
true,
try,
typedef,
typeid,
typename,
union,
unsigned,
using,
virtual,
void,
volatile,
wchar_t,
while,
xor,
xor_eq,
C++ 有 C 没有的关键字
- 格式一
"alignas","alignof","and","and_eq","asm","atomic_cancel","atomic_commit","atomic_noexcept","bitand","bitor","bool","catch","char8_t","char16_t","char32_t","class","compl","concept","consteval","constexpr","constinit","const_cast","co_await","co_return","co_yield","decltype","delete","dynamic_cast","explicit","export","false","friend","inline","mutable","namespace","new","noexcept","not","not_eq","nullptr","operator","or","or_eq","private","protected","public","reflexpr","reinterpret_cast","requires","static_assert","static_cast","synchronized","template","this","thread_local","throw","true","try","typeid","typename","using","virtual","wchar_t","xor",
- 格式二
"alignas",
"alignof",
"and",
"and_eq",
"asm",
"atomic_cancel",
"atomic_commit",
"atomic_noexcept",
"bitand",
"bitor",
"bool",
"catch",
"char8_t",
"char16_t",
"char32_t",
"class",
"compl",
"concept",
"consteval",
"constexpr",
"constinit",
"const_cast",
"co_await",
"co_return",
"co_yield",
"decltype",
"delete",
"dynamic_cast",
"explicit",
"export",
"false",
"friend",
"inline",
"mutable",
"namespace",
"new",
"noexcept",
"not",
"not_eq",
"nullptr",
"operator",
"or",
"or_eq",
"private",
"protected",
"public",
"reflexpr",
"reinterpret_cast",
"requires",
"static_assert",
"static_cast",
"synchronized",
"template",
"this",
"thread_local",
"throw",
"true",
"try",
"typeid",
"typename",
"using",
"virtual",
"wchar_t",
"xor",
- 格式三
alignas,
alignof,
and,
and_eq,
asm,
atomic_cancel,
atomic_commit,
atomic_noexcept,
bitand,
bitor,
bool,
catch,
char8_t,
char16_t,
char32_t,
class,
compl,
concept,
consteval,
constexpr,
constinit,
const_cast,
co_await,
co_return,
co_yield,
decltype,
delete,
dynamic_cast,
explicit,
export,
false,
friend,
inline,
mutable,
namespace,
new,
noexcept,
not,
not_eq,
nullptr,
operator,
or,
or_eq,
private,
protected,
public,
reflexpr,
reinterpret_cast,
requires,
static_assert,
static_cast,
synchronized,
template,
this,
thread_local,
throw,
true,
try,
typeid,
typename,
using,
virtual,
wchar_t,
xor,