// if the element of array matches with another element in the same 
// array, then increment the counter.
 
if( my_array[i] == my_array[j] ) 
{
     ++counter ; // counter = counter + 1
}
 
// my_array = {1, 2, 1, 3, 4, 5 }
// my_array[i] = my_array[0] = 1 
// counter = 2 ( since 1 has a match at 0th and 2nd position )

#include <conio.h>
#include <fstream.h>
#include <iomanip.h>
#include <iostream.h>
 
ofstream fout;                                    // output textfile declaration
using namespace std;
 
// =============================================================================
 
int main ()
 
  {
    int i, count;
    char reply;
    double x[100];
 
    fout.open ("array.txt");                    // prepares output textfile
 
    // introduction
 
    for (i = 1; i <= 9; i++)
      {
        cout << endl;
      }
    cout << setw (52) << "STORING DATA IN AN ARRAY" << endl;
    cout << endl << endl;
    cout << setw (66) << "This program will prompt the user for a set of numbe";
    cout << "rs:" << endl;
    cout << endl << endl;
    cout << setw (56) << " Press ENTER to continue ... ";
    cin.get ();
 
    // prompting the user for a set of numbers
 
    count = 0;
 
    fout << setw (52) << "Data stored in array";
    fout << endl << endl;
 
    do // while there is more input data
       {
         count++;
 
    do // while data is incorrect
       {
         clrscr ();
 
         for (i = 1; i <= 11; i++)
              {
                cout << endl;
              }
 
         cout << setw (56) << "Enter data " << count << "or enter -1 to end";
         cout << " data entry:";
         cin >> x [count];
 
    if (count % 25 == 0)
 
        {
 
         fout << "\f";
         fout << setw (45) << "Values Stored in an Array";
         fout << endl << endl;
 
        } 
            do // while response is invalic
              {
                clrscr ();
 
                for (i = 1; i <= 11; i++)
                  {
                    cout << endl;
                  }
 
            while (y != -1);
              }
   do // record verified data in output textfile
      {
        fout << setw (32) << "#" << count << ")" << setw (5) << count;
        fout << endl << endl;
 
      do // while response is invalid
          {
            clrscr ();
 
            for (i = 1; i <= 9; i++)
              {
                cout << endl;
              }
          }
   while (count != -1)
       }
 
    cin.get ();
    fout.close ();                                     // closes output textfile
    return 0;
 
  }