SDL_isalpha - Query if a character is alphabetic (a letter).

       This function is available since SDL 3.2.0.

Simple Directmedia Layer                           SDL 3.2.10                                     SDL_isalpha(3)

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

x      character value to check.

       Defined in SDL3/SDL_stdinc.h

       SDL_isalpha - Query if a character is alphabetic (a letter).

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

#include"SDL3/SDL.h"intSDL_isalpha(intx);

       It is safe to call this function from any thread.