He doesn't die
Yes.
no the whole place gets nuked
It is not known. At the end of the last book, he is still living.
Yes, loads of people.
*SPOILER ALERT* If the film is true to the book, Harry will sacrifice himself to be killed, but not actually die.
Snape dies in Harry Potter and the Deathly Hallows (book 7, the last) on page 658 and his last words, spoken to Harry, were "Look ... at ... me ..."
Probably not, since he doesn't die in the book on which the movie is based.
No, he is the main character in the series. The only book he could have died in was the last one.
No. He defeats Voldemort and then grows up and marries Ginny.
Ron didn't watch Harry die in the last book, although he did see Harry's (not-so-dead) body, which he assumed was dead.
No, in the epilogue of the final book he is married and has a child, Scorpius.
They die in the last book in the battle of hogwarts