Question

I have a vector and I am adding elements using push_back.

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.

The vector size is 2 also- even though I have only inserted once.

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

Answer 1

The first element should be vector[0].

For example:

int anumber = 300;
std::vector<int> intvector;
intvector.push_back(anumber);

std::cout << intvector[0];

Will print 300.