How does vector iteration work in C++?

How does vector iteration work in C++?

In C++, vector iteration allows you to traverse elements in a vector using loops. You can use a for loop, range-based for loop, or iterators.

Can you show me an example using a for loop?

Sure! Here's a simple example:

#include <iostream>
#include <vector>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    for (size_t i = 0; i < vec.size(); ++i) {
        std::cout << vec[i] << " ";
    }
    return 0;
}

What about using iterators?

Using iterators is also straightforward. Here's an 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;
}

Are there any performance differences between these methods?

Generally, the performance difference is negligible for small vectors. However, iterators can be more flexible and safer in certain contexts.