Namespaces
Variants
Views
Actions

std::atan

From cppreference.com
< cpp‎ | numeric‎ | math
 
 
 
Common mathematical functions
Functions
Basic operations
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)
Exponential functions
(C++11)
(C++11)
(C++11)
(C++11)
Power functions
(C++11)
(C++11)
Trigonometric and hyperbolic functions
(C++11)
(C++11)
(C++11)
Error and gamma functions
(C++11)
(C++11)
(C++11)
(C++11)
Nearest integer floating point operations
(C++11)(C++11)(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)
Floating point manipulation functions
(C++11)(C++11)
(C++11)
(C++11)
(C++11)(C++11)
(C++11)
Classification/Comparison
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
Macro constants
(C++11)(C++11)(C++11)(C++11)(C++11)
 
Defined in header <cmath>
float       atan( float arg );
double      atan( double arg );
long double atan( long double arg );
double      atan( Integral arg );
(since C++11)

Computes arc tangent of arg

[edit] Parameters

arg - value of a floating-point or Integral type

[edit] Return value

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

std::atan(+0) returns +0. std::atan(-0) returns -0

std::atan(+) returns +π/2. std::atan(-) returns -π/2

[edit] See also

arc tangent, using signs to determine quadrants
(function) [edit]
computes arc sine (arcsin(x))
(function) [edit]
computes arc cosine (arccos(x))
(function) [edit]
computes tangent (tan(x))
(function) [edit]
computes arc tangent of a complex number (arctan(z))
(function template) [edit]
applies the function std::atan to each element of valarray
(function template) [edit]