What is the first element in a vector?
<p>I have a vector and I am adding elements using push_back.</p>

<p>When I am debugging I have added one element to the vector, but the vector contains elements for [0] and [1]. The [1] is the element which I pushed on, but [0] looks like some sort of nullable object.</p>

<p>The vector size is 2 also- even though I have only inserted once.</p>

<p>Later in my code I will traverse the vector using <code>vector_name[i]</code>. Initially I would start with <code>i=0</code>, does this mean with a vector you should use 1 (or some sort of iterator)?</p>
