Namespace

/*I just did this because I was bored*/

//A namespace is basically a class but you can store var, func and classes in it!

#include <iostream>
using namespace std;

namespace PROGRAM_1
{
    int x = 18;
    int y = 34;
}

namespace PROGRAM_2
{
    void Hello()
    {
        cout << "Hello world!" << endl;
    }
}

int main()
{
    using namespace PROGRAM_2; //This means that you can use var and funcs without needing to type in the scope ::

    cout << PROGRAM_1::x + PROGRAM_1::y << endl; //Here we need to type :: because we didn't do: using namespace PROGRAM_1;

    Hello(); //If we didn't include using namespace PROGRAM_2; We would have to do: PROGRAM_2::Hello();

    return 0;
}