No, you don't have to with US-ASCII and iso-8859-1.
Sure you do. It's not a difficult encoding, but it still is an encoding.
Unicode is a character set, not an encoding, so that sentence is broken.
Wait. You are saying that a sentence of the form "X is an encoding of Y" is broken in English is Y isn't an encoding?

I guess that "UTF-8 is an encoding of Unicode" is equally broken. For the reason that Unicode isn't an encoding in that sentence either.

In reply to Re^9: How to reverse a (Unicode) string by JavaFan
in thread How to reverse a (Unicode) string by moritz

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