How do respond to "How are you doing?"

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I was just wondering how you guys responded when someone greets you by saying "How you doing?" If I'm walking down the street, in the store, or something like that and someone I don't know greets me by saying "How ya doing?" I just say "Hi." I usually don't answer the question if I'm just passing someone by. I don't know, maybe subconsciously I figure that they don't really care how I'm doing, they're just greeting me. So, I respond with a greeting- hi or hello. Sometimes I might answer the question. I'm more likely to do so if I know the person or if I'm going to be engaged in additional conversation. When I was a child it was also emphasized that you dont respond to "How you doing" with the word "good". Using the word "good" isn't good enough. Then, as I became a teenager I learned that if a guys asks you "how you doing" and you say "fine" he's likely to say "You sure are!". Get it?