Which is, incidentally, why you can also write `index[var]`. `[]` is really just a convenience for `*(var + index)`. In fact that's exactly how the standard defines it (or at least defined it as of C11, I've not checked more recent versions):

A postfix expression followed by an expression in square brackets [] is a subscripted designation of an element of an array object. The definition of the subscript operator [] is that E1[E2] is identical to (*((E1)+(E2))).