#include <stdio.h>

int days_per_month(int month,int year)
{
    int days=0;
    switch(month)
    {
    case 1:
    case 3:
    case 5:
    case 7:
    case 8:
    case 10:
    case 12:
      days = 31;
      break;
    case 4:
    case 6:
    case 9:
    case 11: 
      days = 30;
      break;
    case 2:
      days = 28;
      if(year%4 == 0)
        days++;

      break;
    }
    return days;

}

int main(void)
{
  int st_year, end_year,st_month, end_month, cur_year,cur_month,days;

  printf("Enter starting month: ");
  scanf("%d",&st_month);
  printf("Enter starting year: ");
  scanf("%d",&st_year);
  printf("Enter ending month: ");
  scanf("%d",&end_month);
  printf("Enter ending year: ");
  scanf("%d",&end_year);

  days=0;

  /* Starting year */
  cur_month = st_month;
  while(cur_month<=12)
  {
    days += days_per_month(cur_month,st_year);
    cur_month++;
  }

  /* In between years excluding starting and ending years */
  cur_year = st_year+1;
  while (cur_year <= end_year-1)
  {
    days = days + 365;
    if(cur_year%4 == 0)
    {
      days++;
    }
    cur_year++;
  }

  /* Last year */
  cur_month = 1;
  while(cur_month<=end_month)
  {
    days += days_per_month(cur_month,end_year);
    cur_month++;
  }

  printf("Total number of days between %02d/%d and %02d/%d is %d\n",st_month,st_year,end_month,end_year,days);

  return 0;
}