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Exactly. That's why your do-while loop never exited with the logical or: there was always at least one true expression, so the entire statement evaluated to true. It could never be false. Now examine...

&& is logical and. It means what you think it does: Is this true, and is that true? || is logical or. Note that its use in programming (and math) is a little different from its use in English: Is...

Try building a logic table for your do-while conditional.

If sentinelChar = 'Y', is it true or false? What if sentinelChar = 'a', or sentinelChar = 'n'?

What is it doing that's wrong? Is there a compile/runtime error? What message is it giving you?