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atan2

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Defined in header <math.h>
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<td >
float       atan2f( float y, float x );
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<td class="t-dcl-nopad"> </td> <td > (since C99) </td> </tr> <tr class="t-dcl ">

<td >
double      atan2( double y, double x );
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<td >
long double atan2l( long double y, long double x );
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<td class="t-dcl-nopad"> </td> <td > (since C99) </td> </tr> Template:ddcl list end

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

Contents

Parameters

x, y - floating point value

Return value

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

Example

See also

Template:c/numeric/math/dcl list atanTemplate:c/numeric/math/dcl list asinTemplate:c/numeric/math/dcl list acosTemplate:c/numeric/math/dcl list tan