#include <stdio.h>
int main ()
{
int a,b,c;
printf("输入年份和月份\n");
scanf("%d%d",&a,&b);
switch(b)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
c=31;
break;
case 4:
case 6:
case 9:
case 11:
c=30;
break;
case 2:
if((a%4==0)&&(a%100!=0)||(a%400==0))
c=29;
else
c=28;
break;
default:
c=-1;
break;
}
if(c==-1)
printf("输入了错误的月份");
else
printf("%d年%d月有%d天\n",a,b,c);
return 0;
}