Untitled

// Sort appointments by datetime
void sortAppointments(Appointment appoints[], int size)
{
    int i, j, swapped = 0, done = 0;
    Appointment temp;

    for (i = 0; i < size - 1 || done == 1; i++)
    {
        // we subtract 'i' because we don't need to check indexed we have already visited and swapped
        for (j = 0; j < (size - i - 1); j++)
        {
            int toSwap; // keeps track of whether an element is higher than the one in the previous index
            if (appoints[j].date.year != appoints[j + 1].date.year)
            {
                toSwap = appoints[j].date.year - appoints[j + 1].date.year;
            }
            else if (appoints[j].date.month != appoints[j + 1].date.month)
            {
                toSwap = appoints[j].date.month - appoints[j + 1].date.month;
            }
            else if (appoints[j].date.day - appoints[j + 1].date.day)
            {
                toSwap = appoints[j].date.day - appoints[j + 1].date.day;
            }
            else if (appoints[j].time.hour - appoints[j + 1].time.hour)
            {
                toSwap = appoints[j].time.hour - appoints[j + 1].time.hour;
            }
            else
            {
                toSwap = appoints[j].time.min - appoints[j + 1].time.min;
            }

            // this swaps two array elements
            if (toSwap > 0)
            {
                temp = appoints[j];
                appoints[j] = appoints[j + 1];
                appoints[j + 1] = temp;
                // this lets us know there was at least one swap in the iteration
                swapped = 1;
            }
        }
        if (!swapped)
        {
            // Algorithm is done if there was no swap for an entire pass
            done = 1;
        }
    }
}