Mathematical functions

Integer arithmetic

Name	Brief description
abs	Absolute value (integer)
div	Division (integer)
labs	Absolute value (long integer)
llabs	Absolute value (long long integer)
ldiv	Division (long integer)
lldiv	Division (long long integer)

Floating-point numbers

Name	Brief description
acos, acosf, acosl	Arc cosine
asin, asin, asinl	Arc sine
atan, atanf, atanl	Arc tangent x
atan2, atan2f, atan2l	Arc tangent x/y
cabs	Absolute value of a complex number
ceil	Round up to integer
cos, cosf, cosl	Cosine
cosh, coshf, coshl	Hyperbolic cosine
erf, erff, erfl	Error function
erfc, erfcf, erfcl	Complement of the error function
exp, expf, expl	Exponential function (base e)
expm1, expm1f, expm1l	Exponential function (base e)  - 1
exp2, exp2f, exp2l	Exponential function (base 2)
fabs, fabsf, fabsl	Absolute value of a floating-point number
fdim, fdimf, fdiml	Positive difference
floor	Round down to an integer
fmod, fmodf, fmodl	Remainder of a division
frexp, frexpf, frexpl	Normalized representation in base 2
gamma	Logarithmic gamma function
hypot, hypotf, hypotl	Euclidean distance
j0, j1, jn	Bessel functions of the first kind
ldexp, ldexpf, ldexpl	Calculate binary value
lgamma, lgammaf, lgammal	Logarithmic gamma function
log, logf, logl	Natural log
log10, log10f, log10l	Base 10 log
log1p, log1pf, log1pl	Natural log + 1
log2, log2f, log2l	Base 2 log
modf, modff, modfl	Split into integer part and fractional part
nearbyint, nearbyintf, nearbyintl	Nearest integer
pow, powf, powl	General exponential function
sin, sinf, sinl	Sine
sinh, sinhf, sinhl	Hyperbolic sine
sqrt, sqrtf, sqrtl	Square root
tan, tanf, tanl	Tangent
tanh, tanhf, tanhl	Hyperbolic tangent
y0, y1, yn	Bessel functions of the second kind

Functions for rounding (dependent on rounding mode)

Name	Brief description
llrint, llrintf, llrintl	Rounds floating-point number to nearest integer of type long long int
lrint, lrintf, lrintl	Rounds floating-point number to nearest integer of type long int
rint, rintf, rintl	Rounds floating-point number to nearest integer as floating-point number
nearbyint, nearbyintf, nearbyintl	Rounds floating-point number to nearest integer as floating-point number

Functions for rounding (independent of rounding mode)

Name	Brief description
ceil, ceilf, ceill	Rounds floating-point number up to nearest integer as floating-point number
floor, floorf, floorl	Rounds floating-point number down to nearest integer as floating-point number
llround, llroundf, llroundl	Rounds floating-point number to nearest integer of type long long int
lround, lroundf, lroundl	Rounds floating-point number to nearest integer of type long int
round, roundf, roundl	Rounds floating-point number to nearest integer as floating-point number
trunc, truncf, truncl	Rounds floating-point number to nearest integer towards 0 as floating-point number