# Common mathematical functions

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< cpp‎ | numeric

### Functions

Defined in header `<cstdlib>`
abs(int)labs llabs (C++11) | computes absolute value of an integral value (|x|) (function)
div(int)ldiv lldiv (C++11) | computes quotient and remainder of integer division (function)
Defined in header `<cinttypes>`
abs(std::intmax_t)imaxabs (C++11)(C++11) | computes absolute value of an integral value (|x|) (function)
div(std::intmax_t)imaxdiv (C++11)(C++11) | computes quotient and remainder of integer division (function)
Defined in header `<cmath>`

##### Basic operations

abs(float) fabs | absolute value of a floating point value (|x|) (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)
log2 (C++11) | base 2 logarithm of the given number (log2(x)) (function)
log1p (C++11) | natural logarithm (to base e) of 1 plus the given number (ln(1+x)) (function)

##### Power functions

pow | raises a number to the given power (xy) (function)
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)

##### 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) | computes the inverse hyperbolic sine (arsinh(x)) (function)
acosh (C++11) | computes the inverse hyperbolic cosine (arcosh(x)) (function)
atanh (C++11) | computes the inverse hyperbolic tangent (artanh(x)) (function)

##### Error and gamma functions

erf (C++11) | error function (function)
erfc (C++11) | complementary error function (function)
tgamma (C++11) | gamma function (function)
lgamma (C++11) | natural logarithm of the 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)

### Types

Defined in header `<cstdlib>`
div_t | structure type, return of the std::div function (typedef)
ldiv_t | structure type, return of the std::ldiv function (typedef)
lldiv_t (C++11) | structure type, return of the std::lldiv function (typedef)
Defined in header `<cinttypes>`
imaxdiv_t (C++11) | structure type, return of the std::imaxdiv function (typedef)
Defined in header `<cmath>`
float_t (C++11) | most efficient floating-point type at least as wide as float (typedef)
double_t (C++11) | most efficient floating-point type at least as wide as double (typedef)

### Macro constants

Defined in header `<cmath>`
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)

##### Classification

FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C++11)(C++11)(C++11)(C++11)(C++11) | indicates a floating-point category (macro constant)

### See also

Special math TR | for Mathematical special functions
C documentation for Common mathematical functions

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