Provided by: libsdl3-doc_3.2.20+ds-2_all 

NAME
SDL_islower - Report if a character is lower case.
SYNOPSIS
#include <SDL3/SDL_stdinc.h>
int SDL_islower(int x);
DESCRIPTION
WARNING: Regardless of system locale, this will only treat ASCII values 'a' through 'z' as true.
FUNCTION PARAMETERS
x character value to check.
RETURN VALUE
Returns non-zero if x falls within the character class, zero otherwise.
THREAD SAFETY
It is safe to call this function from any thread.
AVAILABILITY
This function is available since SDL 3.2.0.
Simple Directmedia Layer SDL 3.2.20 SDL_islower(3)