Listing 10 Initializing constant variables

extern "C"
{
    unsigned int _osver;
    unsigned int _winver;
    unsigned int _winmajor;
    unsigned int _winminor;
}

int WINAPI WinMain( ... )
{
    _osver = GetVersion();

    _winminor = (_osver >> 8) & 0x00FF ;
    _winmajor = _osver & 0x00FF ;
    _winver = (_winmajor << 8) + _winminor;
    _osver = (_osver >> 16) & 0x00FFFF ;
}