function in a namespace reference variables in the same namespace : namespace « Language Basics « C++ Tutorial

1. C++ Tutorial
2. Language Basics
3. namespace

#include <iostream>
using namespace std;

int integer1 = 98;

namespace Example
{
   const double PI = 3.14159;
   void printValues();

   namespace Inner
   {
      enum Years { FISCAL1 = 1990, FISCAL2, a };
   }
}

namespace
{
   double doubleInUnnamed = 88.22;
}

int main()
{
   Example::printValues();
   return 0;
}
void Example::printValues()
{
   cout << integer1 << "\n(global) integer1 = " << ::integer1
      << "\nIinteger1 = " << Inner::a << endl;
}

98
(global) integer1 = 98
Iinteger1 = 1992