Update the code in main() that adds nodes to the list. Replace the lines shown below at the left with those on the right. if(infile. good()) { p = new node(name); p->put(cout); if(head==NULL) head = p; else q->add(p); q = p; }; ← if(infile. good()) { p = new node(name); p->put(cout); if(head==NULL) head = p; else head->add(p); }; If head is NULL, then the list is empty and head is set to p. Otherwise, head is used to call the add() function.

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