Using namespace to reference variables

  
#include <iostream>
using namespace std;

namespace first
{
  int x = 5;
  int y = 10;
}

namespace second
{
  double x = 3.1416;
  double y = 2.7183;
}

int main () {
  using namespace first;
  cout << x << endl;
  cout << y << endl;
  cout << second::y << endl;
  cout << second::x << endl;
  return 0;
}

Related examples in the same category

1.	Namespace Demo: define a namespace
2.	Namespaces are additive
3.	Demonstrate a namespace
4.	Some Namespace Options
5.	A namespace can be nested within another
6.	use explicit std:: qualification.
7.	Namespace code section
8.	Use namespaces to wrap variables
9.	Enclosure variables with namespace
10.	Defines and tests namespaces.

Using namespace to reference variables : NameSpace « Language « C++

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