application never quits

[harmodrew]

hello! I'm writing the following application:

main.cpp:

#include <QtGui/QApplication>
#include "mainwindow.h"
#include <QInputDialog>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
    MainWindow w;
 
    QInputDialog id;
    bool ans1, ans2;
    int i1 = id.getInt(&w, w.tr("Title"), w.tr("Text"),0,0,20,1,&ans1));
    int i2 = id.getInt(&w, w.tr("Title"), w.tr("Text"),0,0,20,1,&ans2));
 
    if (ans1 && ans2)
    {
        w.showMaximized();
    }
    else
    {
        w.close();
    }
 
    return a.exec();
 
}

#include <QtGui/QApplication>
#include "mainwindow.h"
#include <QInputDialog>

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

    MainWindow w;

    QInputDialog id;
    bool ans1, ans2;
    int i1 = id.getInt(&w, w.tr("Title"), w.tr("Text"),0,0,20,1,&ans1));
    int i2 = id.getInt(&w, w.tr("Title"), w.tr("Text"),0,0,20,1,&ans2));

    if (ans1 && ans2)
    {
        w.showMaximized();
    }
    else
    {
        w.close();
    }

    return a.exec();

}

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If I chose "OK" for both the first input dialog and the second one then the program continues rightly and clicking the classic "X" it exits correctly.
While if I chose "Cancel" in one of the input dialogs the window doesn't show (and I want it) but the application doesn't quit at all. It remains running in RAM.
I found this behaviour by debugging the program putting a breakpoint at the row "return a.exec();". This instruction never stop (so the program loops in the exec() function). what can it be?

thanks