#include <stdio.h>
main()
{
int days,month,year;
printf("请输入年月：");
scanf("%d%d",&year,&month);
if (year%400==0 || (year%4==0 && year%100!=0))
{
switch(month)
{
case 4:
case 6:
case 9:
case 11:
days=30;
break;
case 2:
days=29;
break;
default:
days=31;
break;
}
}
else
{
switch(month)
{
case 4:
case 6:
case 9:
case 11:
days=30;
break;
case 2:
days=28;
break;
default:
days=31;
break;
}
}
printf("%d\n",days);
}
