CABS - Overview of Functions

Overview of Functions

Most of the mathematical functions are placed in math.h header (cmath header in C++). The functions that operate on integers, such as abs, labs, div, and ldiv, are instead specified in the stdlib.h header (cstdlib header in C++).

Any functions that operate on angles use radians as the unit of angle.

Not all functions are available in C89 version of the C standard. For those that are, the functions accept only type double for the floating-point arguments. In C99, this limitation was fixed by introducing new sets of functions that work on float and long double arguments. Those functions are identified by f and l suffixes respectively.

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

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