loop through vector in c++ code example

Example 1: c++ iterate through vectgor

std::vector<int> vec_of_ints(100);
for (int i = 0; i < vec_of_ints.size(); i++){
 	std::cout << vec_of_ints.at(i) << " "; 
}
std::cout << std::endl;

Example 2: c++ iterate over vector

for(auto const& value: a) {
     /* std::cout << value; ... */
}

Example 3: for loop vector

for (auto i = v.begin(); i != v.end(); i++)
    {
        std::cout << *i << endl;
    }