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 << "\n" << 
        "Square=" << MathOps::square(MathOps::x);

    return 0;
}