How do I modify elements in a C++ std::vector?

How do I modify elements in a C++ std::vector?

You can modify elements in a std::vector using indexing or iterators. For example, to change the first element, you can do vec[0] = newValue;.

Can you show me an example of using iterators to modify a vector?

Sure! Here's an example:

#include <vector>
#include <iostream>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};
    for(auto it = vec.begin(); it != vec.end(); ++it) {
        *it *= 2; // Modify each element by multiplying by 2
    }
    for(int num : vec) {
        std::cout << num << ' ';
    }
}

This will output: 2 4 6 8 10.

What if I want to remove an element from the vector?

You can remove an element using the erase method. For example, to remove the second element, you can do vec.erase(vec.begin() + 1);.

Is there a way to add elements to the vector?

Yes! You can add elements using the push_back method. For example, vec.push_back(newValue); adds newValue to the end of the vector.