91 IntList& IntList::operator=(const IntList& source){
 92     //deep copy version
 93     Node* n = new Node;
 94     Node* p = source.first;
 95     IntList* list = new IntList;
 96     list->first = n;
 97     while(p) {
 98         if (!n) {
 99             Node* s = new Node;
100             s->info = p->info;
101             n = s;
102         } else {
103             n->info = p->info;
104         }
105         n = n->next;
106         p = p->next;
107     }
108     return *list;
109 }