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I was told by my Japanese teacher that 「うん」 can be used as a casual way to say
"yes" _as well as_ "no." If this is true, how can you tell the difference,
absent any additional information?
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2012-04-26T08:17:55.050
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2012-04-26T11:30:45.913
2012-04-26T08:34:43.797
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meaning
How can 「うん」 be used to mean both "yes" and "no?"
By default, it means yes/correct.

But regardless of the question form: negative or positive, the うん confirms it.
ううん denies it.

In English, _I am not sure_ but I don't think you would say "No, I am going"
after being asked "Aren't you going to school today ?". But in Japanese, ううん
would be used.
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2012-04-26T09:11:29.367
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2012-04-26T11:18:39.513
2012-04-26T11:18:39.513
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It's possible that your teacher was talking about how to respond to negative
questions in Japanese.
[This](https://japanese.stackexchange.com/questions/2908/the-reality-of-
answering-%E3%81%84%E3%81%84%E3%81%88-to-a-negative-question) is a good
explanation for that.

In this case, though, I think your teacher was talking about うん vs ううん.

A straightforward うん with a falling intonation means yes. A lengthened ううん,
often with high, then lower, then middle pitch can be used to express doubt,
denial or disagreement (it may be helpful to ask your teacher to demonstrate).

As oldergod says, this is often used when answering a negative-question, but
it doesn't have to be used this way. In my friend's copy of Genki I have seen
something like:

> A: 子供の時、元気だった？  
>  B: うん、元気だった ／ ううん、元気じゃなかった
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2012-04-26T09:13:11.673
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2012-04-26T11:30:45.913
2017-04-13T12:43:44.397
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