atan

From cppreference.com
< c | numeric | math
 
 
 
Common mathematical functions
Functions
Basic operations
remainder (C99)
remquo (C99)
fma (C99)
fmax (C99)
fmin (C99)
fdim (C99)
nan
nanf
nanl
(C99)
(C99)
(C99)
Exponential functions
exp
exp2 (C99)
expm1 (C99)
log
log10
log1p (C99)
log2 (C99)
Power functions
sqrt
cbrt (C99)
hypot (C99)
pow
Trigonometric and hyperbolic functions
sinh
cosh
tanh
asinh (C99)
acosh (C99)
atanh (C99)
Error and gamma functions
erf (C99)
erfc (C99)
lgamma (C99)
tgamma (C99)
Nearest integer floating point operations
ceil
floor
round
lround
llround
(C99)
(C99)
(C99)
trunc (C99)
nearbyint (C99)
rint
lrint
llrint
(C99)
(C99)
(C99)
Floating point manipulation functions
ldexp
scalbn
scalbln
(C99)
(C99)
ilogb (C99)
logb (C99)
Classification
fpclassify (C99)
isfinite (C99)
isinf (C99)
isnan (C99)
isnormal (C99)
signbit (C99)
Macro constants
 
Defined in header <math.h>
float       atanf( float arg );
(since C99)
double      atan( double arg );
long double atanl( long double arg );
(since C99)

Computes arc tangent of arg

[edit] Parameters

arg - floating point value

[edit] Return value

Arc tangent of arg in radians in the range of [-π/2; π/2] radians.

[edit] See also

arc tangent, using signs to determine quadrants
(function)
computes arc sine (arcsin(x))
(function)
computes arc cosine (arccos(x))
(function)
computes tangent (tan(x))
(function)