Why do we use 'namespace std'??

Answer 1

In my 12th standard when I did programming in c++ we neither use std:: in any situation

Answer 2

thank you very much!!

Answer 3

To avoid putting std:: in front of lots of words.

For example :
cout << "hello world" << endl
is in fact :
std::cout << "hello world" << std::endl

So we put "using namespace std;" to simplify

Answer 4

because it defines that standard c++ library is to be used