Answer / sameer

it because arrays index are pointers and you are giving
offsets from the base pointer & base pointer is starting
element address so it has offset zero from base pointer

Answer / surya.raj

Since I found this questions answer on a another website and
I can do copy and paste from there, but in order to make
copyright and royalty of original poster I am not tending to
do that so, here is the link below from where you can get
answer of your question.

http://developeronline.blogspot.com/2008/04/why-array-index-should-start-from-0.html

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