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int days_in_month[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
                      
void add_days_to_date(int *mm, int *dd, int *yy, int days_left_to_add)
{
  int days_left_in_month;
  while(days_left_in_month > 0)
  {
    days_left_in_month = days_in_month[*mm] - *dd;
 //   days_left_in_month = days_in_month[*mm] - *dd;
    if (days_in_month[2] && is_leap_year(*yy) == true)
    {
      days_left_in_month++;
    }
   } // end while
   printf("after while\n");
    if(days_left_to_add > days_left_in_month)
    {
      days_left_to_add -= days_left_in_month;
      *dd = 1;
      if(*mm == 12)
      {
        *mm = 1;
        (*yy)++;
      }
      else
      {
        (*mm)++;
      }
    }
    else
    {
      *dd += days_left_to_add;
      days_left_to_add = 0;
    }
}
int main()
{
  int mm, dd, yy, days_left_to_add;
  printf("Please enter a date between the years 1800 and 10000 in the format mm dd yy and provide the number of days to add to this date:\n");
  scanf("%d %d %d %d", &mm, &dd, &yy, &days_left_to_add);
 // printf("\nREAD\n");
  //These are pointers, so they have to be at certain location i.e. int* mm = &mm
  add_days_to_date(&mm, &dd, &yy, days_left_to_add);
  printf("%d %d %d\n", mm, dd, yy);
}

International CCC - 12/27/2022
Puzzles are eligible to be posted starting at 00:00 GMT
Clue remains available for 24 hours.
Winners may become Setters if they choose.

Quote:

Since the Sun is much more massive than Earth, the center of mass is closer to the Sun.
The center of mass, in fact, is inside the diameter of the Sun, so the resulting wobble caused by Earth is small.