Namespaces can be declared

NOTE : -

THIS CONTENT IS NOT ORIGINAL

9. Namespaces can be declared

Namespaces can be declared. The variables declared within a namespace can be used thanks to the :: operator:

using namespace std;
#include 
#include 

namespace first
{
  int a;
  int b;
}

namespace second
{
  double a;
  double b;
}

int main ()
{
  first::a = 2;
  first::b = 5;

  second::a = 6.453;
  second::b = 4.1e4;

  cout << first::a + second::a << endl;
  cout << first::b + second::b << endl;

  return 0;
}

Output

8.453 41005

BIBILOGRAPHY / REFERENCE : - http://www.4p8.com/eric.brasseur/cppcen.html