#include <string>
#include <iostream>
#include <fstream>

struct person
{ string fname, lname;    // object's variables are MEMBERS.
  int ssn, bd;
                          // object's functions are called METHODS
  void print()
  { cout << fname << " " << lname << ", SSN=" << ssn
         << ", born " << bd << "\n"; }

           // a method with no return type and the same name as
           // the struct is a CONSTRUCTOR.
           // If you define any constructor, then a constructor
           // will be called every time an object is created. It
           // can't be prevented. If none of the constructors are
           // suitable, the program will not compile.
  person(int s, string f, string l, int b)
  { ssn = s;
    fname = f;
    lname = l;
    bd = b; }
};

person * * read_data()
{ ifstream in("/home/www/class/een118/labs/database1.txt");
  if (in.fail())
  { cerr << "No file\n";
    exit(1); }
  person * * array = new person * [1010];

  // array is a pointer to an array of pointers to persons
  // a pointer to an array, so we can be flexible and use new
  //        and not need to know the size in advance
  // an array of pointers so that we don't find ourselves
  //        using copies of objects

  int num = 0;
  while (num < 1010)
  { int a, b;
    string c, d;
    in >> a >> c >> d >> b;   // The file contains ssn fname lname bd
    if (in.fail())
      break; 
    array[num] = new person(a, c, d, b);
    num += 1; }
  in.close();
  return array; }

person * find_oldest(person * * data, int size)
{ int oldest = data[0]->bd, oldestpos = 0;
  for (int i=1; i<size; i+=1)
    if (data[i]->bd < oldest)
    { oldest = data[i]->bd;
      oldestpos = i; }
  return data[oldestpos]; }

void main()
{ person * * data = read_data();
  person * x = find_oldest(data, 1000);

  // x is a pointer to the object from the array, not a copy
  // of it, so it allows us to change the one and only person
  // object for the oldest man

  x->print();
  cout << "Change his name...\n";
  x->fname = "Old Man";
  x->print();

  int a = 2+2;

  person * y = find_oldest(data, 1000);
  y->print(); }