#include <iostream.h>
#include <fstream.h>
#include "CPstring.h"

// file: stats2.cc; author: D. Ramm; date: 10/13/96
// file input; while with EOF to exit
// Initialization from first data point
// stats for undeterminded input

int main()
{
   int number, count = 0;
   int sum, max, min;
   string filename;
   ifstream filein;

   cout << "Enter file name: ";
   cin >> filename;

   filein.open(filename);

   if (filein >> number)
   {
      count = 1;
      sum = number;
      max = number;
      min = number;
   }

   while (filein >> number)
   {
      count++;
      sum += number;

     if (number > max)
         max = number;
      if (number < min)
         min = number;
   }
   if (count == 0)
      cout << "No data found in file " << filename << endl;
   else
      cout << "For " << count << " numbers read, Max = " << max
         << ", Min = " << min << ", Mean = " << 1.0*sum/count << endl;


   return 0;
}

Sample output:

stats2 
Enter file name: testdata
For 6 numbers read, Max = 45, Min = -21, Mean = 8.83333

cat testdata
23  45
-11 3
14 -21

stats2
Enter file name: emptydata
No data found in file emptydata

cat emptydata