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Last evening a question was asked I replied and it was accepted.
Then the OP edited the question and asked a related question, however that can stand alone with some meaning.
So, Can I give two different answers or, I should edit the answer and append the answer of the second question?
It depends on how much the question was edited. If it was just an extension off the first post but still closely related to the original question then you should edit/update your current answer. If it's off-topic from the original question then OP should post a new question. I would attempt to improve your current answer unless your answers are two different approaches.
Yes you can, but I'd say you would rarely need to. Bear in mind that the user can only accept one answer, and the fullest answer to address the OPs problem(s) would be best marked as the correct answer - so, you can benefit from the system in terms of gaining rep (even this is a dubious possibility) but you're potentially contributing to breaking the system simultaneously.
If the two problems are distinct, then it's better to encourage the OP to create a new question, providing appropriate context.
Example:
Why won't my code execute this logic path? Could its performance be improved?
If the two problems are closely related, then it's fine to answer them in the same question.
Example:
Why won't my code execute this logic path? Do I have to add another check at the beginning of my loop to get it there?
