SDL_isalnum - Query if a character is alphabetic (a letter) or a number.

       This function is available since SDL 3.2.0.

Simple Directmedia Layer                           SDL 3.2.20                                     SDL_isalnum(3)

WARNING:  Regardless  of  system  locale, this will only treat ASCII values for English 'a-z', 'A-Z', and
       '0-9' as true.

x      character value to check.

       SDL_isalnum - Query if a character is alphabetic (a letter) or a number.

       Returns non-zero if x falls within the character class, zero otherwise.

#include<SDL3/SDL_stdinc.h>intSDL_isalnum(intx);

       It is safe to call this function from any thread.