用C语言输入今年的年月日输出天是今年的第几天

void main()
{
	int year, month, day, days, leap;
	printf("\n请输入日期（格式：年,月,日）:");
	scanf_s("%d,%d,%d", &year, &month, &day);
	if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)) //如果是闰年
		leap = 1;
	else
		leap = 0;
	days = day;
	switch (month - 1)
	{
	case 11:days += 30;
	case 10:days += 31;
	case 9:days += 30;
	case 8:days += 31;
	case 7:days += 31;
	case 6:days += 30;
	case 5:days += 31;
	case 4:days += 30;
	case 3:days += 31;
	case 2:
		if (leap == 1)
			days += 29;
		else
			days += 28;
	case 1:days += 31;
	}
	printf("\n%d年%d月%d日是该年的第%d天\n", year, month, day, days);
	getchar();getchar();
	return ;
}