namnhuan(2).cpp

#include <stdio.h>
#include <iostream>
using namespace std;

int main(void)
{
	int thang,nam;
	cout<<" nhap thang: ";cin>>thang;
	cout<<" nhap nam:";cin>>nam;
	
	switch(thang)
	{
		case 1:
		case 3:
		case 5:
		case 7:
		case 8:
		case 10:
		case 12:
			cout<<"co 31 ngay"; break;
		case 4:
		case 6:
		case 9:
		case 11:
			cout<<"co 30 ngay"; break;
		case 2:
			if ( nam %400==0 || (nam %4 && nam % 100 != 0))
			{ 
			cout<<" co 29 ngay ";	
			}	
			else
			{
				cout<<" co 28 ngay";
			}
			break;
		default:
			cout<<" nhap du lieu khong dung";
		
	}
}