SDL_toupper - Convert low-ASCII English letters to uppercase.

       This function is available since SDL 3.2.0.

Simple Directmedia Layer                           SDL 3.2.10                                     SDL_toupper(3)

WARNING : Regardless of system locale, this will only convert ASCII values 'a' through 'z' to uppercase.

       This  function  returns the uppercase equivalent of x . If a character cannot be converted, or is already
       uppercase, this function returns x .

x      character value to check.

       Defined in SDL3/SDL_stdinc.h

       SDL_toupper - Convert low-ASCII English letters to uppercase.

       Returns capitalized version of x, or x if no conversion available.

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

       It is safe to call this function from any thread.