Is this sentence correctly punctuated?

Question

Hello, Mr. Daniels, how are you doing?

Is Hello, Mr. Daniels considered a sentence on its own?
i.e. Hello, Mr. Daniels. How are you doing?

Also, how would the sentence below be punctuated?

Hello, Doctor Williams I am one of you students.

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Answer 1 · 2016-04-22T14:52:59

"Hello, Mr. Daniels, how are you doing?" is in fact, correctly punctuated, but the way it is written is unnecessary.

It should be written/is more commonly written as, "Hello, Mr. Daniels. How are you doing?"

The sentence, "Hello, Doctor Williams I am one of your students," should be written as this:

"Hello, Doctor Williams. I am one of your students." But if you want it shortened, it's written like this:

"Hello, Dr. Williams. I'm one of your students."