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> The answer should not be negative, but the app says "-4".

When I do those exact keypresses I get the correct answer.

When I do those exact keypresses I also get "-4".

Can you show what you’re seeing?

I get the same, fwiw

thats what I see too

That's iOS 18.5, maybe they fixed it in later versions

Good for you? The fact this happens on my versions of both MacOS and iOS means they didn't have automated tests covering this from day one.

Famously, "it works for me" is not how high quality software happens.

It seems basically impossible that math works differently on your calculator app than somebody else’s.

Can you post a recording of what you’re seeing?

What iOS version is that? It seems odd that the UI does not match what I see.

Whoa! What calculator is that?

Some googling shows hits from iOS 18 betas, where folks reported this bug, that seem to have the same UI.

Good for me too? I get the correct answer when I type the keys, exactly as you specified. On both macOS and iOS