C++ Iterator class

Define an Iterator class.

Answer
An iterator class is used to iterate through objects of the container class. An iterator is an entity that gives access to the contents of a container object.

Define an Iterator class.

Answer
A container class hold group of objects and iterator class is used to traverse through the objects maintained by a container class. The iterator class provides access to the classes inside a container. They are objects that point to other objects. Iterator points to one element in a range, and then it is possible to increment it so that it points to the next element.

There are several different types of iterators:

input_iterator
output_iterator
forward_iterator
bidirectional_iterator
random_iterator
reverse_iterator

Explain different types of iterators, i.e. input_iterator, output_iterator etc.

Answer
Input Iterator: These iterators can read values in the forward movement. They can be incremented, compared and dereferenced.
Ouptut Iterator: They write values in the forward movement. They can be incremented and dereferenced.
Forward Iterator: They are like input and output iterators that can read and write values in forward movement.
Bidirectional iterators: These can Read and write values with forward and backward movement and can be incremented, decremented.
random_access_iterator: Can read and write values randomly.

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