Use of iterators over array indices

Question

I just wanted to know what is the main advantage of using the iterators over the array indices. I have googled but i am not getting the right answer.

Answer 1

The STL contains algorithms, such as transform and for_each that operate on containers. They don't accept indices, but use iterators.

Iterators help hide the container implementation and allow the programmer to focus more on the algorithm. The for_each function can be applied to anything that supports a forward iterator.