#include <iostream.h>
#include <conio.h>


void pause (void) {

  cout << "\nHit any key to continue...\n";
  getch ();

}


int convert_to_total_minutes (int hours, int minutes) {

  return (hours * 60) + minutes;

}


int main () {

  int count = 0, new_time, last_time, gap, longest_gap = -1,
      hours, minutes;
  long gap_total = 0;

  for (;;) {

    cout << "Enter time in hours and minutes (99 99 to stop): ";
    cin >> hours >> minutes;

    if ((hours == 99) && (minutes == 99)) {
      break;
    }

    if ((hours < 0) || (hours > 23) || (minutes < 0) || (minutes > 59)) {

      cout << "** Time ignored - hours and/or minutes invalid." << endl;

    } else {

      new_time = convert_to_total_minutes (hours, minutes);

      if (count == 0) {
        // our very first time
        last_time = new_time;
        count++;
      } else if (new_time < last_time) {
        cout << "** Time ignored - not >= previous time **" << endl;
      } else {
        gap = new_time - last_time;
        gap_total += gap;
        if (gap > longest_gap) {
          longest_gap = gap;
        }
        last_time = new_time;
        count++;
      }

    }

  }

  if (count < 2) {
    cout << "Fewer than 2 times were entered - no gaps to analayze.\n";
  } else {
    cout << count << " times were entered.\n"
         << "The longest gap is " << longest_gap << " minutes long.\n"
         << "The average gap length is " << gap_total / (count - 1.0)
         << " minutes.\n";
  }

  pause ();
  return 0;

}