vector and loops example

#include <iostream>
#include <vector>

int main()
{
    std::size_t num_of_elements;
    std::cout << "Desired vector size: ";
    std::cin >> num_of_elements;
    std::vector<int> vec(num_of_elements);
    std::cout << "Vector size is " << vec.size() << std::endl;
    std::cout << "Value for each element:" << std::endl;
    for (std::size_t i { 0 }; i < vec.size(); ++i)
    { // using array [] indexing syntax
        std::cout << "vec[" << i << "] = ";
        std::cin >> vec[i];
    }
    int sum { 0 }; // calculated via ranged for
    for (auto& element : vec) sum += element;
    std::cout << "The sum the vector is " << sum << std::endl;
    return 0;
}