Example use namespace

[giorgik]

Hello everyone, I was studying the use of namespaces and tried to take a simple example, which in part works but the process is suspended, not closed.
First things first, this is my example:
geometria.h

#ifndef GEOMETRIA_H
#define GEOMETRIA_H
 
namespace Geometria {
    float Norma(int i) {
        float risultato = (float)i/6;
        return risultato;
    }
}
 
#endif // GEOMETRIA_H

#ifndef GEOMETRIA_H
#define GEOMETRIA_H

namespace Geometria {
    float Norma(int i) {
        float risultato = (float)i/6;
        return risultato;
    }
}

#endif // GEOMETRIA_H

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main.cpp

#include <QCoreApplication>
    #include <iostream>
    #include "geometria.h"
 
    using namespace std;
    using namespace Geometria;
 
    int main(int argc, char *argv[])
    {
        QCoreApplication a(argc, argv);
 
        float ris = Norma(3);
        cout << "Il risultato è: " << ris << endl;
 
        return a.exec();
    }

#include <QCoreApplication>
    #include <iostream>
    #include "geometria.h"

    using namespace std;
    using namespace Geometria;

    int main(int argc, char *argv[])
    {
        QCoreApplication a(argc, argv);

        float ris = Norma(3);
        cout << "Il risultato è: " << ris << endl;

        return a.exec();
    }

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When I launch the program, I see the result in Qt-Creator 2.5.0 but the program does not close, I have to do it by CTRL + ALT + DEL.
Can you tell me where I went wrong?