Help me out with this code plz!

Question

#include<iostream>
#include<complex>

using namespace std;

namespace alpha {int var =0;}
namespace beta {
int var = alpha :: var +=2;
}

int main ()
{
beta :: var += alpha :: var;
{
using namespace beta;
cout<< alpha :: var + var;
}
}
i cannot understand what's going on in this code can someone help me understanding this.

Answer 1

Just a wee reminder, please use the code playground so it's easier for us to help you.

Answer 2

use the code playground and refer to the c++ course

Answer 3

namespace this is a special place in which you can define variables to avoid name conflicts. http://en.cppreference.com/w/cpp/language/namespace