Inserting elements into an array of a class..

Here is the question..  I need to insert another voter into the array using a function.  The program starts out by reading an input file and stores it in an array of the voter class.. Have that working all.. I am having the worst time trying to write a function to add onto that array from user input.

I dont want the answer just some idea what i need to do...   I currently go to university of buffalo and as of an elective the make us take cs121

#include "fileutil.cpp"

#include<iostream.h>
#include<conio.h>
#include<iomanip.h>
#include<string.h>
#include<ctype.h>
#include<fstream.h>

#if !defined(microsoft)
#include<stdlib.h>
#define cls() system("cls");
#endif

//*****************************************************************************
// Beginning of Voter Class                                                   *
//*****************************************************************************

class Voter
{
      private:
            int idnumber;
            char lastname[25];
            char firstname[25];
            char party[2];
            int birthyear;
            int currentage;

      public:
            Voter();
            Voter(int,char[], char[], char[], int, int);
            Voter(const Voter&);
            void read();
            void operator =(const Voter&);
            void print();
            ~Voter();
};

//*****************************************************************************
// Default Constructor                                                        *
//*****************************************************************************

Voter::Voter()
{
      idnumber = 0;
      lastname[0] = '\0';
      firstname[0] = '\0';
      party[2] = '\0';
      birthyear = 0;
      currentage = 0;
}

//*****************************************************************************
// Constructor Arguments                                                      *
//*****************************************************************************

Voter::Voter(int id,char ln[], char fn[], char pid[], int year, int by)
{
      idnumber = id;
      strcpy(lastname, ln);
      strcpy(firstname, fn);
      strcpy(party, pid);
      birthyear = year;
      currentage = 2003 - birthyear;
}

//*****************************************************************************
// Copy Constructor                                                           *
//*****************************************************************************

Voter::Voter(const Voter& v1)
{
      idnumber = v1.idnumber;
      strcpy(lastname, v1.lastname);
      strcpy(firstname, v1.firstname);
      strcpy(party, v1.party);
      birthyear = v1.birthyear;
      currentage = 2003 - v1.birthyear;
}

//*****************************************************************************
// Get Voter Information                                                      *
//*****************************************************************************

void Voter::read()
{
      cls();
      char trash[2];
      
      cout<<"Enter your voter id number: "<<endl;
      cin >> idnumber;
      
      cout<<"Enter your last name: " << endl;
      cin.getline(trash,2);
      cin.getline(lastname, 25);

      cout<<"Enter your first name: " << endl;
      cin.getline(firstname, 25);

      cout<<"Enter your party id letter: " << endl;
      cin>>party;

      cout<<"Enter your birth year: " << endl;
      cin>>birthyear;

      currentage = 2003 - birthyear;
}

//*****************************************************************************
// Assignment Operator                                                        *
//*****************************************************************************

void Voter::operator =(const Voter& v1)
{
      idnumber = v1.idnumber;
      strcpy(lastname, v1.lastname);
      strcpy(firstname, v1.firstname);
      strcpy(party, v1.party);
      birthyear = v1.birthyear;
      currentage = 2003 - v1.birthyear;
}

//*****************************************************************************
// Print List of Voters                                                       *
//*****************************************************************************

void Voter::print()
{
      cout << idnumber    << setw(12)
              << lastname    << setw(12)
             << firstname   << setw(12)
           << party       << setw(12)
             << birthyear      << setw(12)
             << currentage  << setw(12)
         << endl;
}

//*****************************************************************************
// Destructor                                                                 *
//*****************************************************************************

Voter::~Voter()
{

}

//*****************************************************************************
// Prototye Declaration                                                       *
//*****************************************************************************

void PrintList(Voter voterlist[], int);
void ReadData(Voter voterlist[], int&);
int Display_Menu(int);

//*****************************************************************************
// Main Body of Propgram                                                       *
//*****************************************************************************

void main()
{



      
      
Voter voterlist[8];
int error = 0;

ReadData(voterlist,error);
cls();


PrintList(voterlist, error);
cout << endl; // just using these to lines while testing program...
getche();        //




}


//*****************************************************************************
// Function Name: Display_Menu
// Purpose: This purpose of this function is to display the main menu of this
//          program to the terminal screen.  Then the user will enter there the
//          selection.
//
// Parameters:
//   Input:
//   Input & Output:
// Return Value: choice
// Non-local Variables Used: choice
// Functions Called:iomanip - setw

//*****************************************************************************

int Display_Menu(int choice)
{
      cls();
    cout << setw(25) << "\n ========== Menu Selection Screen ============= \n";
      cout << setw(25) << "\n   [1] Display voters to display                  ";
      cout << setw(25) << "\n   [2]                                                     ";
      cout << setw(25) << "\n   [3]                                                         ";
      cout << setw(25) << "\n   [4]                                            ";
      cout << setw(25) << "\n   [5]                                            ";
      cout << setw(25) << "\n   [6] Exit Program                             \n";
      cout << setw(25) << "\n ============================================== \n"  
             << endl;
      
            cout << setw(22) << "Enter Selection >  ";
            cin  >> choice;

      return choice;

}

//*****************************************************************************
// Function Name: ReadData
// Purpose: The purpose of this function is to read in values from a txt file
//          supplied by the teacher. This function will read in whitespace and
//          check for errors.
//
// Parameters:
//   Input:
//   Input & Output:
// Return Value: choice
// Non-local Variables Used:
// Functions Called:

//*****************************************************************************

void ReadData(Voter voterlist[], int& error)
{

      int  age,
             idnumber,
             birthyear,
             currentage = 0,
             numVoters  = 0;

      char lastname[25],
             firstname[25],
             party[2],
             trash[2];

      ifstream infile;
      ofstream outfile;


      OpenInput( infile, "Give name of Data File:  " );

      while (infile.good() )
      {
            infile >> idnumber;
            infile.getline(trash,2);
            infile.getline(lastname,25,'\t');
            infile.getline(firstname, 25, '\t');
            infile.getline(party, 2, '\t');
            infile >> birthyear;

            age = 2003 - birthyear;


if ((strcmp(party, "r") == 0) || (strcmp(party, "R") == 0) ||
      (strcmp(party, "d") == 0) || (strcmp(party, "D") == 0) ||
      (strcmp(party, "l") == 0) || (strcmp(party, "L") == 0) ||
      (strcmp(party, "c") == 0) || (strcmp(party, "C") == 0))
{
      
      if ((idnumber > 1000) && ( idnumber < 10000))
      {
            
            if ((age > 17) && (age < 126))
            {
                  voterlist[numVoters] = Voter(idnumber,lastname, firstname, party, birthyear, currentage);
                  ++ numVoters;
            }
            else
                error++;
      }
      else
            error++;
}
else
      error++;

if (infile.fail())
break;

}
infile.close();
}

//*****************************************************************************
// Function Name: PrintList
// Purpose:Prints Voter information to display.
//
// Parameters:
//   Input:
//   Input & Output:
// Return Value: choice
// Non-local Variables Used:
// Functions Called:

//*****************************************************************************

void PrintList(Voter voterlist[], int error)
{

      for (int n = 0;n<(8 - error) ;n++)
      {
            voterlist[n].print();
      }
}

//*****************************************************************************
// Function Name:
// Purpose:Prints:
//
// Parameters:
//   Input:
//   Input & Output:
// Return Value: choice
// Non-local Variables Used:
// Functions Called:

//*****************************************************************************