C++ 给出日期，求他的第二天是几号

bool leapYear(int year)
{
	if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)
		return true;
	return false;
}

int GetMonthDay(int year, int month)
{
	static int days[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };//每次来都不动
	int day = days[month];
	if (month == 2)
		if (leapYear(year))
		{
			day += 1;
		}
	return day;
}

int main()
{
	int year, month, day;
	scanf("%d-%d-%d", &year, &month, &day);

	day += 1;

	while (day > GetMonthDay(year, month))
	{
		day -= GetMonthDay(year, month);
		month++;
		if (month == 13)
		{
			year++;
			month = 1;
		}
	}
	printf("%d-",year);
	if(month<10)
		printf("0%d-", month);
	else
		printf("%d-", month);

	if (day < 10)
		printf("0%dn", day);
	else
		printf("%dn", day);

	return 0;
}