#include <QtGui>

int main (int argc, char* argv[]) {                 
    QApplication app(argc, argv);                   
    QTextStream cout(stdout);                       

    // Declarations of variables
    int answer = 0;                                 

    do {
        // local variables to the loop:
        int factArg = 0;
        int fact(1);
        factArg = QInputDialog::getInt(0, "Factorial Calculator",
            "Factorial of:", 1);                    
        cout << "User entered: " << factArg << endl;
        int i=2;
        while (i <= factArg) {
            fact = fact * i;
            ++i;
        }
        QString response = QString("The factorial of %1 is %2.\n%3")
            .arg(factArg).arg(fact)                 
            .arg("Compute another factorial?");     
        answer = QMessageBox::question(0, "Play again?", response,
            QMessageBox::Yes | QMessageBox::No);    
    } while (answer == QMessageBox::Yes);
    return EXIT_SUCCESS;
}