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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Report if a character is upper case.

Header File

Defined in <SDL3/SDL_stdinc.h>


int SDL_isupper(int x);

Function Parameters

int x character value to check.

Return Value

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


WARNING: Regardless of system locale, this will only treat ASCII values 'A' through 'Z' as true.

Thread Safety

It is safe to call this function from any thread.


This function is available since SDL 3.0.0.

CategoryAPI, CategoryAPIFunction, CategoryStdinc

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