Standard library header <cmath>

 

C++

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Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

Standard Library header files

Language Support
<cstddef> <limits> <climits> <cfloat> <cstdint> <new> <typeinfo> <exception> <ciso646>	<initializer_list> <csignal> <csetjmp> <cstdalign> <cstdarg> <cstdbool> <cstdlib> <ctime>
Diagnostics
<stdexcept> <cassert>	<cerrno> <system_error>
General utilities
<utility> <tuple> <bitset> <memory> <cstdlib> <cstring> <functional>	<type_traits> <ratio> <chrono> <ctime> <scoped_allocator> <typeindex>
Strings
<string> <cctype> <cwctype> <cstring>	<cwchar> <cstdlib> <cuchar>
Localization
<locale> <codectv> <clocale>

Containers
<array> <deque> <forward_list> <list> <vector> <map>	<set> <unordered_map> <unordered_set> <queue> <stack>
Iterators
<iterator>
Algorithms
<algorithm>	<cstdlib>
Numerics
<cfenv> <complex> <random> <valarray>	<numeric> <cmath> <ctgmath> <cstdlib>
Input/Output
<iosfwd> <iostream> <ios> <streambuf> <istream> <ostream>	<iomanip> <sstream> <fstream> <cstdio> <cinttypes>
Regular expressions
<regex>
Thread support
<thread> <mutex> <atomic>	<condition_variable> <future>

 

This header was originally in the C standard library as <math.h>.

This header is part of the numeric library.

Types

float_t	most efficient floating-point type at least as wide as float
double_t	most efficient floating-point type at least as wide as double
Defined in header <cstdlib>
div_t	structure type, return of the std::div function
ldiv_t	structure type, return of the std::ldiv function
lldiv_t	structure type, return of the std::lldiv function

Macro constants

HUGE_VALF HUGE_VAL HUGE_VALL (C++11) (C++11)	indicates the overflow value for float, double and long double respectively (macro constant)
INFINITY (C++11)	evaluates to positive infinity or the value guaranteed to overflow a float (macro constant)
NAN (C++11)	evaluates to a quiet NaN of type float (macro constant)
math_errhandling MATH_ERRNO MATH_ERREXCEPT (C++11) (C++11) (C++11)	defines the error handling mechanism used by the common mathematical functions (macro constant)

Functions

Basic operations
abs(int) labs llabs imaxabs (C++11)	computes absolute value of an integral value (|x|) (function)
abs(float) fabs	absolute value of a floating point value (|x|) (function)
div ldiv lldiv imaxdiv (C++11)	the quotient and remainder of integer division (function)
fmod	remainder of the floating point division operation (function)
remainder (C++11)	signed remainder of the division operation (function)
remquo (C++11)	signed remainder as well as the three last bits of the division operation (function)
fma (C++11)	fused multiply-add operation (function)
fmax (C++11)	larger of two floating point values (function)
fmin (C++11)	smaller of two floating point values (function)
fdim (C++11)	positive difference of two floating point values (max(0, x-y)) (function)
nan nanf nanl (C++11) (C++11) (C++11)	not-a-number (NaN) (function)
Exponential functions
exp	returns e raised to the given power (ex) (function)
exp2 (C++11)	returns 2 raised to the given power (2x) (function)
expm1 (C++11)	returns e raised to the given power, minus one (ex-1) (function)
log	computes natural (base e) logarithm (to base e) (ln(x)) (function)
log10	computes common (base 10) logarithm (log10(x)) (function)
log1p (C++11)	natural logarithm (to base e) of 1 plus the given number (function)
log2 (C++11)	base 2 logarithm of the given number (function)
Power functions
sqrt	computes square root (√x) (function)
cbrt (C++11)	computes cubic root (3√x) (function)
hypot (C++11)	computes square root of the sum of the squares of two given numbers (√x2 +y2 ) (function)
pow	raises a number to the given power (xy) (function)
Trigonometric functions
sin	computes sine (sin(x)) (function)
cos	computes cosine (cos(x)) (function)
tan	computes tangent (tan(x)) (function)
asin	computes arc sine (arcsin(x)) (function)
acos	computes arc cosine (arccos(x)) (function)
atan	computes arc tangent (arctan(x)) (function)
atan2	arc tangent, using signs to determine quadrants (function)
Hyperbolic functions
sinh	computes hyperbolic sine (sh(x)) (function)
cosh	computes hyperbolic cosine (ch(x)) (function)
tanh	hyperbolic tangent (function)
asinh (C++11)	hyperbolic arc sine (function)
acosh (C++11)	hyperbolic arc cosine (function)
atanh (C++11)	hyperbolic arc tangent (function)
Error and gamma functions
erf (C++11)	error function (function)
erfc (C++11)	complementary error function (function)
lgamma (C++11)	natural logarithm of the gamma function (function)
tgamma (C++11)	gamma function (function)
Nearest integer floating point operations
ceil	nearest integer not less than the given value (function)
floor	nearest integer not greater than the given value (function)
trunc (C++11)	nearest integer not greater in magnitude than the given value (function)
round lround llround (C++11) (C++11) (C++11)	nearest integer, rounding away from zero in halfway cases (function)
nearbyint (C++11)	nearest integer using current rounding mode (function)
rint lrint llrint (C++11) (C++11) (C++11)	nearest integer using current rounding mode with exception if the result differs (function)
Floating point manipulation functions
frexp	decomposes a number into significand and a power of 2 (function)
ldexp	multiplies a number by 2 raised to a power (function)
modf	decomposes a number into integer and fractional parts (function)
scalbn scalbln (C++11) (C++11)	multiplies a number by FLT_RADIX raised to a power (function)
ilogb (C++11)	extracts exponent of the number (function)
logb (C++11)	extracts exponent of the number (function)
nextafter nexttoward (C++11) (C++11)	next representable floating point value towards the given value (function)
copysign (C++11)	copies the sign of a floating point value (function)
Classification and comparison
fpclassify (C++11)	categorizes the given floating point value (function)
isfinite (C++11)	checks if the given number has finite value (function)
isinf (C++11)	checks if the given number is infinite (function)
isnan (C++11)	checks if the given number is NaN (function)
isnormal (C++11)	checks if the given number is normal (function)
signbit (C++11)	checks if the given number is negative (function)
isgreater (C++11)	checks if the first floating-point argument is greater than the second (function)
isgreaterequal (C++11)	checks if the first floating-point argument is greater or equal than the second (function)
isless (C++11)	checks if the first floating-point argument is less than the second (function)
islessequal (C++11)	checks if the first floating-point argument is less or equal than the second (function)
islessgreater (C++11)	checks if the first floating-point argument is less or greater than the second (function)
isunordered (C++11)	checks if two floating-point values are unordered (function)