math.h

The math.h header file contains function declarations for all the floating-point math functions.

No feature test macro required.

absf()

absl()

acos()

acosf()

acosl()

asin()

asinf()

asinl()

atan()

atanf()

atanl()

atan2()

atan2f()

atan2l()

ceil()

ceilf()

ceill()

cos()

cosf()

cosl()

cosh()

coshf()

coshl()

exp()

expf()

expl()

fabsf()

fabsl()

floor()

floorf()

floorl()

fmod()

fmodf()

fmodl()

frexp()

frexpf()

frexpl()

ldexp()

ldexpf()

ldexpl()

log()

logf()

logl()

log10()

log10f()

log10l()

modf()

modff()

modfl()

pow()

powf()

powl()

sin()

sinf()

sinl()

sinh()

sinhf()

sinhl()

sqrt()

sqrtf()

sqrtl()

tan()

tanf()

tanl()

tanh()

tanhf()

tanhl()

Special Behavior for C++

For C++ applications, each of the base functions in the preceding list is also overloaded for float, double, and long double. For example:

float sqrt(float)
double sqrt(double)
long double sqrt(long double)

_XOPEN_SOURCE

erf()

erfc()

gamma()

hypot()

isnan()

jn()

j0()

j1()

lgamma()

yn()

y0()

y1()

_XOPEN_SOURCE_EXTENDED 1

acosh()

asinh()

atanh()

cbrt()

expm1()

ilogb()

logb()

log1p()

nextafter()

remainder()

rint()

scalb()

The header file includes declarations for the built-in functions abs() and fabs(). For information about built-in functions, see Built-in Functions.

The math.h header file declares the macro HUGE_VAL, which expands to a positive double expression.

For all mathematical functions, a domain error occurs when an input argument is outside the range of values allowed for that function. If a domain error occurs, errno is set to the value of EDOM.

A range error occurs if the result of the function cannot be represented in a double value. If the magnitude of the result is too large (overflow), the function returns the positive or negative value of the macro HUGE_VAL, and sets errno to ERANGE. If the result is too small (underflow), the function returns a value of 0.