#include <iostream>           // Standard in/out header
#include <fstream>            // File io header

using namespace std;

int main()
{
    ifstream fin;               // Create a input file stream
    ofstream fout;              // Create a output file stream
    int counter=0, input;       // A counter and a dummy input

    fin.open("p100in.txt");     // Open the input file

    while(!fin.eof())           // Loop until we find the end of file
    {
        fin >> input;           // Read in the dummy input
        counter++;              // Increase the counter
    }

    fin.close();                // Close the input file

    fout.open("p100out.txt");   // Open the output file
    fout << counter << endl;    // Write the number of numbers
    fout.close();               // Close the output file

    return 0;                   // We're done
}

#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream fin;
    ofstream fout;
    int input;
    int counter=0;

    fin.open("p100in.txt");

    while(!fin.eof()) {
      fin >> input;
      cout << "input = " << input << " with counter = " << counter << endl;
      if (!fin) {
        cout << "fin failed with counter = "  << counter << endl;
      }
      counter++;
      cout << "After incrementing, counter = " << counter << endl << endl;
    }
    fin.close();
    cout << "After loop, counter = " << counter << endl;
    fout.open("p100out.txt");
    fout << counter << endl;
    fout.close();
    cout << "Press 'Enter': ";
    cin.get(); 
    return 0;
}