iterators can't access problems properly

Question

I am trying to access the element of a vector using the iterator. But I get strange outputs.

std::vector ivec{ 7, 6 , 8, 9} ; 

std::vector

        

Answer 1

end iterators are not iterators that you can de-reference. They point past the last element into the container. There's a good reason why this needs to be true; but long and short, the end iterator does not actually point to any element. If you want the last element, you need to decrement the end iterator.