计算某天是一年中的第几天 很经典

 

很经典的题目:

当给你某个日期，让你计算该日期在该年中时第几天。

这里可以巧用switch语句。

程序如下：

	
	int t_nMon;
	int t_nDay;
	cout << "输入月：";
	cin >> t_nMon;
	cout << "输入天：";
	cin >> t_nDay;
         int s_ndays = 0;

	switch(t_nMon-1) 
	{
	case 12:s_ndays += 31;
	case 11:s_ndays += 30;
	case 10:s_ndays += 31;
	case 9:s_ndays += 30;
	case 8:s_ndays += 31;
	case 7:s_ndays += 31;
	case 6:s_ndays += 30;
	case 5:s_ndays += 31;
	case 4:s_ndays += 30;
	case 3:s_ndays += 31;
	case 2:s_ndays += 28;
	case 1:s_ndays += 31;
	}

	s_ndays = s_ndays + t_nDay;
	cout << s_ndays <<endl;