// L-5 MCS 360 Fri 24 Jan 2020 : use_phonebook2.cpp

/* Below we illustrate the use of dynamic memory allocation and
   deallocation as a variation of the other program use_phonebook.cpp.

   A possible application could be to keep a backup copy of the
   phone book when we provide a delete operation.

   For this program to execute properly, the file phonebook_data.txt
   must be in the same folder as the executable.

   An example of typical content for the file phonebook_data.txt is
   in the three lines below (exclude the blank line):

   2
   111-222-4444 Elliot Koffman
   333-666-9999 Paul Wolfgang

 */

#include <iostream>
#include "phonebook.h"

using namespace std;

int main ( int argc, char* argv[] )
{
   PhoneBook *b;

   cout << "welcome to our phone book" << endl;
   cout << "reading data from file ..." << endl;

   b = new PhoneBook;

   int n = b->length();

   cout << "number of entries : " << n << endl;
   if(argc == 1)
      for(int k=0; k<n; k++)
         cout << "  entry " << k << " : " 
              << (*b)[k] << endl;
   else
   {
      string new_entry;

      cout << "give new entry : ";
      getline(cin,new_entry);

      b->add(new_entry);
   }

   b->~PhoneBook();

   return 0;
}