/* This shows only the ptable struct definition and main, not the whole program

   The things to look at are the protected:, public:, get_number, and get_element
   in ptable, and main itself.
*/

struct ptable
{ 
  protected:

    element T[150];
    int max, num;

  public:

    ptable()
    { max = 150;
      num = 0;
      T[0] = element(0, "Q", "Nosuchthingium", 0.0); }

    int get_number()
    { return num; }

    element get_element(int i)
    { if (i>=1 && i<=num)
        return T[i];
      else
        return T[0]; }

    void read_table()
    { ifstream elfile("elements.txt");
      if (elfile.fail())
      { cerr << "could not open elements.txt\n";
        return; }

      while (true)
      { string n, s;
        double a;

        elfile >> s >> n >> a;
        if (elfile.fail())
          break;

        num = num + 1;
        if (num >= max)
        { cerr << "too many elements\n";
          exit(1); }

        T[num] = element(num, s, n, a); }

      elfile.close();
      cout << num << " elements read\n"; }

    element find_sym(const string & sy)
    { int i = 1;
      while (i <= num)
      { if (T[i].symbol == sy)
          return T[i];
        i = i + 1; }
      return T[0]; } };

int main()
{ ptable PT;
  PT.read_table();

  cout << "element 17 is " << PT.get_element(17) << "\n";
  cout << "element 107 is " << PT.get_element(107) << "\n";
  cout << "element 157 is " << PT.get_element(157) << "\n"; }

/* Everything has been made safe
   Brainless users can't cause disasters with

     cout << "element 17 is " << PT.T[17] << "\n";
     cout << "element 107 is " << PT.T[107] << "\n";
     cout << "element 157 is " << PT.T[157] << "\n";

   any more, because T is proected
*/