#include <iostream>
 
using namespace std;
 
namespace N1
{
    int f(int n) { return n * 2; }
}
namespace N2
{
    int f(double n) { return n * 3; }
}
void main()
{
    using N1::f;
    int i1 = f(1.0);
    cout << "i1 = " << i1;
    using N2::f;
    int i2 = f(1.0);
    cout << "i1 = " << i2;
    system("pause");
}

 

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