CSCI 159: exam practice sample answers

The program below is used as the basis for both question 1 and question 2. It maintains a linked list of names and identifiers: getting names/ids from the user until the user enters "q" instead of a name, then printing out the list contents. 
#include <iostream>
#include <string>
using namespace std;

struct item {
   string name;
   int id;
   item* next;
};

int main()
{
   item* front = nullptr;
   string person;
   do {
      cout << "Enter the name of the next person, e.g. Luthor, or q to quit" << endl;
      cin >> person;
      if (person != "q") {
         int personid;
         cout << "Enter an integer id for " << person << ": " << endl;
         cin >> personid;
         item* i = new (std::nothrow) item;
         if (i != nullptr) {
            i->next = front;
            front = i;
            i->name = person;
            i->id = personid;
         }
      }
   } while (person != "q");

   item* current = front;
   while (current != nullptr) {
      cout << current->name << " " << current->id << endl;
      current = current->next;
   }
   //Sample answer
   current = front;
   while (current != nullptr) {
       item* ItemToBeDeleted = current;
       current = current->next;
       delete ItemToBeDeleted;
   }
   front = nullptr;  // for safety/clarity
   
}

Question 1: Basic linked lists: deleting

Just before the end of the main routine (i.e. after all the prints have been completed), add a loop that deallocates each of the items in the list. (Don't rewrite the whole main routine, just the new loop and an arrow to where it goes.)

Question 2: Basic linked lists: insert function

Write an insert function for the program above that could be called from the loop in the main routine, so that using insert the do-while loop in main would look more like 
   do {
      cout << "Enter the name of the next person, e.g. Luthor, or q to quit" << endl;
      cin >> person;
      if (person != "q") {
         int personid;
         cout << "Enter an integer id for " << person << ": " << endl;
         cin >> personid;
         insert(person, personid, front);
      }
   } while (person != "q");

//Sample answer
// note that front needs to be passed by reference so we can update it
void insert(string pname, int pid, item* &front)
{
   item* current = new (std::nothrow) item;
   if (current != nullptr) {
      current->next = front;
      front = current;
      current->name = pname;
      current->id = pid;
   }
}