#include <iostream>

namespace Tester
{

// Will not compile. 'x' has not been declared yet
// Names must be declared before their use in a namespace see [3.4.1]

// void hw()
// {
//     std::cout << "Hello World val= " << x << std::endl;
// }

    int x = 33;

    void hw()
    {
        std::cout << "Hello World val= " << x << std::endl;
    }
}

int main(int argc, char** argv)
{
    Tester::hw();

    return 0;
}