// simple program using a sentinel-controlled while loop
// reads a number of  integers from the terminal 
// and computes (and outputs) both the smallest 
// and the largest
// User must type -1 to indicate no more integers
#include <iostream.h>

main ()
{
  int numb = -1, min=0, max = 0;

  cout << "This program computes the smallest and ";
  cout << endl;
  cout << "largest of the input positive integers.";
  cout << endl;
  cout << endl;

  cout << "Please input a positive integer" << endl; 
  cout << "(-1 if no more input): ";  
  cin >> numb;
  min = max = numb;

  while (numb != -1)
    {
      if (numb < min)
	min = numb; 
      if (numb > max)
	max = numb;

      cout << "Please input a positive integer" << endl; 
      cout << "(-1 if no more input): ";  
      cin >> numb;

    }

  if (min != -1)
    {
      // at least 1 number was input
      cout << endl;
      cout << "The smallest number is ";
      cout << min << endl;
      cout << "The largest number is ";
      cout << max  << endl;
    }
  else
    {
      cout << "ERROR: no input numbers found!";
      cout << endl;
    }

  return 0;
}