unsigned int size(){ int count=0; while(!isEmpty()){ _head=_head->next; count++; } return count;} and int Queue:: operator[](unsigned int index){ int ret, i; for(iYun Yang's version is here: https://www.blogger.com/blogger.g?blogID=8936735993141520040#editor/target=0; i<indexpost; i++){ retpostID=remove(); } return ret;}5619335165204064832