shutdown Mint OS

[dkaip]

Hello.
I am trying to shutdown Mint OS from with a dialog but nothing works.
What is wrong?

void shutdownLinuxDialog::OnAbout(wxCommandEvent &event)
{
    wxString msg = wxbuildinfo(long_f);
    wxMessageBox(msg, _("Welcome to..."));
    system("shutdown -f");
}

[Moschops]

I expect root privileges are required to execute shutdown at the command line.

[dkaip]

Ok but how a program can shutdown without root privileges?
For example gshutdown how turns off OS?