Uhh... The question was "what's an example of undefined behaviour". I gave one, specifically of an example that could realistically break by relying on undefined behaviour.
That's it. Simple education.
In the context of this post I think that's a good thing because not everyone will understand the topic.
You, however, seen to have read some sort of agenda in the question, which I find a little baffling...
To reiterate/emphasize this point: "undefined", "unspecified", and a few other related terms are Things in C. They have specific, non-interchangeable, well-defined meanings in the C specifications.
That's it. Simple education.
In the context of this post I think that's a good thing because not everyone will understand the topic.
You, however, seen to have read some sort of agenda in the question, which I find a little baffling...