Namespace with Variables and Functions

#include <iostream>
using namespace std;

namespace MathOps 
{
    int x = 10;
    int square(int n) 
    {
        return n * n;
    }
}

int main() 
{
    cout << "x=" << MathOps::x << endl;
    cout << "Square=" << MathOps::square(MathOps::x) << endl;
    return 0;
}