Why someone use std::cout while they can just use cout..

Question

Is it related with namespace ,Does it have any advantage over normal declarations

Answer 1

in c++ you have to include the namespace's/ the libraries before using their functionality.

For example:
using namespace std; //This includes the namespace in the project workspace

so we can use cout in our workspace but if you dont want to include the namespaces u can just tell the computer to use the namespace for a specific tasks using (namespace:thefunctionname)
for example :
std::cout

people use this technique to save memory in large programs as no one wants to include a whole library/namespace just to use a single function present in it.

Answer 2

https://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice

Answer 3

std:cout: A namespace is a declarative region inside which something is defined. So, in that case, cout is defined in the std namespace. Thus, std::cout states that is cout defined in the std namespace otherwise to use the definition of cout which is defined in std namespace

source: google