C++ using namsespace std

xaoc · 02-18-2003, 10:25 AM

Hi there,

I was wondering what does "using namespace std" after the #include statements do?
Our teacher just told us to use it.. but it also works and I have seen codes without it?

GtkUser · 02-18-2003, 02:47 PM

std contains all the names defined in the namespace collection. So typing 'using namespace std' makes all of the collection public which some C++ programmers don't like to do, they would rather make only specific namespaces available (only the ones that they require).

FreakboY · 02-18-2003, 06:54 PM

when u don't specify "using namespace std"
and u try to use the cin & cout functions they
won't work unless u add the ".h" to ur #includes
so keep an eye on that...
if i don't make my self clear please... speak up!

laterz...

GtkUser · 02-18-2003, 07:14 PM

Code:

#include<iostream>

using std::cout;
using std::endl;

int main()
{
  cout << "Hello World." << endl;
  return 0;
}

moeminhtun · 02-18-2003, 07:28 PM

This thread would be helpful.

http://www.linuxquestions.org/questi...threadid=43963