Difference between revisions of "cpp/numeric/math/atan2"

Revision as of 17:05, 19 April 2012

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<td > (4) </td> <td > (since C++11) </td> </tr> Template:ddcl list end

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

4) If any argument has integral type, it is cast to Template:cpp. If any other argument is Template:cpp, then the return type is Template:cpp, otherwise it is Template:cpp.

Parameters

Return value

arc tangent of y/x in radians in the range of [-π; π] radians.

Example

#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";
}

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

See also