#include <iostream.h>
#include <limits.h>

// file: stats1.cc; author: D. Ramm; date: 10/13/96
// while with EOF to exit
// Initialization from limits.h 
// stats for undeterminded input

int main()
{
   int number, count = 0, sum = 0;
   int max = INT_MIN, min = INT_MAX;

   cout << "type in numbers; use ^D to quit" << endl;

   while (cin >> number)
   {
      count++;
      sum += number;
      if (number > max)
         max = number;
      if (number < min)
         min = number;
   }
   if (count == 0)
      cout << "No data entered." << endl;
   else
      cout << "For " << count << " numbers read, Max = " << max
         << ", Min = " << min << ", Mean = " << 1.0*sum/count << endl;

   return 0;
}

Sample output:
stats1
type in numbers; use ^D to quit
23
-23
For 2 numbers read, Max = 23, Min = -23, Mean = 0

stats1
type in numbers; use ^D to quit
1 3 5 6 4 2
For 6 numbers read, Max = 6, Min = 1, Mean = 3.5

stats1
type in numbers; use ^D to quit
-13 0 25 -25 1
For 5 numbers read, Max = 25, Min = -25, Mean = -2.4

stats1
type in numbers; use ^D to quit
No data entered.