Namespace Variables Functions

#include <iostream>
using namespace std;

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

int main() {
    // your code here: print MathOps::x
    cout << "x=" <<MathOps::x<<"\nSquare=";
    // your code here: call MathOps::square(x) and print result
    cout << MathOps::square(MathOps::x);
    return 0;
}

Solving Approach