SDL_isnan - Return whether the value is NaN.

       This function is available since SDL 3.2.0.

x      double-precision floating point value.

       SDL_isnan - Return whether the value is NaN.

       Returns non-zero if the value is NaN, 0 otherwise.

SDL_isnanf(3)

Simple Directmedia Layer                           SDL 3.2.20                                       SDL_isnan(3)

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

       It is safe to call this function from any thread.