How do I use iterators in C++?

How do I use iterators in C++?

In C++, iterators are used to traverse through the elements of a container like vectors or lists. Would you like an example?

Yes, please provide an example of using an iterator with a vector.

Sure! Here's a simple example:

#include <iostream>
#include <vector>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    for (auto it = vec.begin(); it != vec.end(); ++it) {
        std::cout << *it << " ";
    }
    return 0;
}

This code will print the elements of the vector.

What if I want to modify the elements while iterating?

You can modify elements by dereferencing the iterator. For example:

for (auto it = vec.begin(); it != vec.end(); ++it) {
    *it *= 2; // This will double each element
}

This will change the original vector elements.