int main(){
    deque<Cars> card;
    deque<Cars> iterator::iter
    int count=0;
    Cars car(14,15);
    card.push_front(car);
    Cars car(12,45);
    card.push_front(car);
    Cars car(15,60);
    card.push_front(car);
    Cars car(20,45)
    card.push_front(car);
    for(iter=card.begin();iter!=card.end();iter++){
        if(iter->getnum2()==60){
            card.erase(card.begin()+count);

        }
        count=count+1;

    }
    return 0;

}

for ( iter = card.begin(); iter != card.end() ; )
     (iter->getnum2() == 60) ? iter = card.erase(iter) : ++iter;