SDL_atan - Compute the arc tangent of x.

       This function is available since SDL 3.2.0.

       The definition of y=atan(x) is x=tan(y).

       Domain: -INF<=x<=INF

       Range: -Pi/2<=y<=Pi/2

       This  function  operates  on  double-precision  floating point values, use SDL_atanf for single-precision
       floats.

       To calculate the arc tangent of y / x, use SDL_atan2.

       This function may use a different approximation across different versions, platforms and  configurations.
       i.e,  it can return a different value given the same input on different machines or operating systems, or
       if SDL is updated.

x      floating point value.

       SDL_atan - Compute the arc tangent of x.

       Returns arc tangent of of x in radians, or 0 if x=0.

SDL_atanf(3), SDL_atan2(3), SDL_tan(3)

Simple Directmedia Layer                           SDL 3.2.20                                        SDL_atan(3)

#include<SDL3/SDL_stdinc.h>doubleSDL_atan(doublex);

       It is safe to call this function from any thread.