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教程
参考
文章
论坛
参考
C 库
<cassert> (assert.h)
<cctype> (ctype.h)
<cerrno> (errno.h)
C++11
<cfenv> (fenv.h)
<cfloat> (float.h)
C++11
<cinttypes> (inttypes.h)
<ciso646> (iso646.h)
<climits> (limits.h)
<clocale> (locale.h)
<cmath> (math.h)
<csetjmp> (setjmp.h)
<csignal> (signal.h)
<cstdarg> (stdarg.h)
C++11
<cstdbool> (stdbool.h)
<cstddef> (stddef.h)
C++11
<cstdint> (stdint.h)
<cstdio> (stdio.h)
<cstdlib> (stdlib.h)
<cstring> (string.h)
C++11
<ctgmath> (tgmath.h)
<ctime> (time.h)
C++11
<cuchar> (uchar.h)
<cwchar> (wchar.h)
<cwctype> (wctype.h)
容器
C++11
<array>
<deque>
C++11
<forward_list>
<list>
<map>
<queue>
<set>
<stack>
C++11
<unordered_map>
C++11
<unordered_set>
<vector>
输入/输出
<fstream>
<iomanip>
<ios>
<iosfwd>
<iostream>
<istream>
<ostream>
<sstream>
<streambuf>
多线程
C++11
<atomic>
C++11
<condition_variable>
C++11
<future>
C++11
<mutex>
C++11
<thread>
其他
<algorithm>
<bitset>
C++11
<chrono>
C++11
<codecvt>
<complex>
<exception>
<functional>
C++11
<initializer_list>
<iterator>
<limits>
<locale>
<memory>
<new>
<numeric>
C++11
<random>
C++11
<ratio>
C++11
<regex>
<stdexcept>
<string>
C++11
<system_error>
C++11
<tuple>
C++11
<type_traits>
C++11
<typeindex>
<typeinfo>
<utility>
<valarray>
<cmath> (math.h)
函数
abs
acos
C++11
acosh
asin
C++11
asinh
atan
atan2
C++11
atanh
C++11
cbrt
ceil
C++11
copysign
cos
cosh
C++11
erf
C++11
erfc
exp
C++11
exp2
C++11
expm1
fabs
C++11
fdim
floor
C++11
fma
C++11
fmax
C++11
fmin
fmod
C++11
fpclassify
frexp
C++11
hypot
C++11
ilogb
C++11
isfinite
C++11
isgreater
C++11
isgreaterequal
C++11
isinf
C++11
isless
C++11
islessequal
C++11
islessgreater
C++11
isnan
C++11
isnormal
C++11
isunordered
ldexp
C++11
lgamma
C++11
llrint
C++11
llround
log
log10
C++11
log1p
C++11
log2
C++11
logb
C++11
lrint
C++11
lround
modf
C++11
nan
C++11
nanf
C++11
nanl
C++11
nearbyint
C++11
nextafter
C++11
nexttoward
pow
C++11
remainder
C++11
remquo
C++11
rint
C++11
round
C++11
scalbln
C++11
scalbn
C++11
signbit
sin
sinh
sqrt
tan
tanh
C++11
tgamma
C++11
trunc
宏常量
HUGE_VAL
C++11
HUGE_VALF
C++11
HUGE_VALL
C++11
INFINITY
C++11
math_errhandling
NAN
类型
C++11
double_t
float_t
参考
<cmath>
NAN
常量
<cmath> <ctgmath>
NAN
float
非数值 (Not-A-Number)
宏常量，展开为一个
float
类型的表达式，表示一个 NaN，前提是实现支持静默 NaN（否则，它未被定义）。
另见
nan
生成静默 NaN
(函数)
nanf
生成静默 NaN (float)
(函数)
isnan
是否是“非数值”
(宏/函数)