How does while (std::cin >> value) work?

Question

In an example given in C++ Primer,

#include 
using namespace std;

int main() {
    int sum = 0, value = 0;  
    while (std::cin >> va         


        

Answer 1

If you are a beginner you don't need to write

std::

---

everytime. If you have written:

using namespace std;

---

it would do the trick. I hope you got the point. :)