int main(void)
{
char reply;
struct date birthday;
long no_of_days;
do
{
printf("Please enter the date of your ");
printf("birth, in the form: dd mm yy\n");
birthday = read_date();
no_of_days = get_day_number(birthday);
printf("Number of days = %ld\n", no_of_days);
printf("You were born on a ");
write_day(no_of_days % 7);
printf("Do you want to do that again? ");
reply = getchar();
} while (reply == 'y' || reply == 'Y');
return 0;
}
int DateTime::get_difference_in_days(const DateTime &other) const
{
int day1 = get_day_number();
int day2 = other.get_day_number();
return day2 - day1;
}