void zero(unsigned short & uli, int nr){
    unsigned short mask = 0xFU << (2*nr);
    mask = ~mask; //Skapar nollor där vi innan hade ettor!
    cout <<"mask               " <<std::bitset<16>(( mask ))<<endl;
    cout <<"vad vi jobbar med: " <<std::bitset<16>(( uli ))<<endl;
    cout << "vad vi gör: uli &= mask"<<endl;
    uli &=  mask;
    cout <<"resultatet         "<< std::bitset<16>(( uli ));

}

int main() {
    unsigned short test = 0x0U; //är 0
    test = ~(test); //Blir  en massa ettor
   zero(test,3);
}