// File: EnterInt.cpp
// READS AN INTEGER BETWEEN min_n AND max_n INTO n
int enter_int
   (int min_n,	// IN: minimum range value for n
    int max_n)	// IN: maximum range value for n
// Pre:     min_n and max_n are assigned values.
// Post:    If min_n <= max_n, returns the first data value read
//            that has a value between min_n and max_n (inclusive).
//            Otherwise, prints a message and exits.
// Returns: First integer read that has a value between min_n and
//              max_n (inclusive).
{
   // Local data ...
   bool in_range;
   int n;

   // Check for nonempty range
   if (min_n <= max_n)
      in_range = false;
   else
   {
      cerr << "*** ERROR: min_n > max_n in enter_int."
 			<< endl;
      cerr << "Program terminated!" << endl;
      exit(0);
   }

    // Keep reading until a valid number is read
   while (!in_range)
   {
      cout << "Enter a value between " << min_n << " and "
           << max_n << ": ";
      cin >> n;
      in_range = (min_n <= n) && (n <= max_n);
   }  // end while
   return n;
}  // end enter_int