/*文件名:exam4_5.cpp*/
#include <stdio.h>
main()
{
   	int year,mon,days,leap;
   	printf("年.月:");
   	scanf("%4d.%2d",&year,&mon);
   	switch (mon) 
	{
     	case 1:case 3:case 5:
    		case 7:case 8:case 10:
     	case 12:days=31;break;
     	case 4:case 6:case 9:
     	case 11:days=30;break;
 		case 2: if (year%4==0 && year%100!=0 || year%400==0) leap=1;	
				else leap=0;
    			if (leap) 			/*閏年的2月為29天*/
					days=29;
	            else 
					days=28;
   	}
     printf("%d年%d月的天數為%d天\n",year,mon,days);
}