std::atan2

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Defined in header `<cmath>`

float atan2( float y, float x );

double atan2( double y, double x );

long double atan2( long double y, long double x );

Computes the inverse tangent of y/x using the signs of arguments to correctly determine quadrant.

#include <cmath>
#include <utility>
#include <iostream>
 
std::pair<double, double> cartesian_to_polar(double x, double y)
{
    return {std::hypot(x, y), std::atan2(y,x)};
}
 
int main()
{
    std::pair<double, double> polar = cartesian_to_polar(1, 1);
    std::cout << "(1,1) cartesian is (" << polar.first
               << "," << polar.second<< ") polar\n";
}

Output:

(1,1) cartesian is (1.41421,0.785398) polar

[edit] See also

atan

computes arc tangent (

arctan(x)

)
(function)

asin

computes arc sine (

arcsin(x)

)
(function)

acos

computes arc cosine (

arccos(x)

)
(function)

tan

computes tangent (

tan(x)

)
(function)

std::atan2

From Cppreference

Contents

[edit] Parameters

[edit] Return value

[edit] Example

[edit] See also