C++ why std:: at every line instead of adding just once user namespace std;

Question

I am wondering why some C++ programmers use std:::

std::string name;
std::cout << "What is your name?\n";

at every line instead of including just once the user namespace std;

Answer 1

Sabine if you include entire std namespace , it's more burden compared to limited access of making what is required at few lines... it's actually choice to do it either way