Suppose we are given an STL vector container named vec that holds values of type double. What do each of vec[0], vec.front(), *(vec.begin()), *(vec.end() - vec.size())and *(vec.rend()-1) mean?
What will be an ideal response?
They all evaluate to the first element of the container. The expression vec[0] uses index 0 to fetch the first vector element. The expression vec.front() fetches the front element of vec. The expression *(vec.end() - vec.size())starts with an iterator past the end, subtracts the number of elements from this iterator, which results in an iterator to the first element of the vector. The expression *(vec.rend()-1) starts with an iterator in front of the first element, then moves one towards the rear (this is a reverse iterator) resulting in an iterator to the first element of the vector.
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